There's something extraordinarily powerful about words. A few lines, spoken at the right time by the right person, can condense decades of experience into a matter of seconds. In the world of investing, this magic is amplified: quotes from great investors aren't just aphorisms to hang on the office wall, but actual operational tools, compasses that guide decisions when markets go crazy and rationality seems an impossible luxury.

I've always believed that the difference between a mediocre investor and a successful one lies not so much in technical knowledge—that can be acquired through study—as in the ability to stay the course when everything around you seems to be collapsing. And this is where the words of the masters come into play: not because they offer magic recipes, but because they remind us that others before us have weathered the same storms and emerged stronger.

Get Paid First: The Forgotten Prerequisite

Before even discussing stocks, bonds, or portfolio strategies, there's a crucial step that too many aspiring investors skip. In his classic The Richest Man in Babylon , George Samuel Clason expressed it with disarming simplicity: "Pay yourself first." David Chilton, in his bestselling book The Wealthy Barber , took up this concept and turned it into a mantra for generations of North American savers.

The point is almost banal in its clarity: to have even a chance at building wealth through investments, you must first save money. You must pay yourself before giving in to the social, biological, and psychological pressures that lead many people to spend beyond their means. Automating your savings—through direct deductions from your paycheck to a retirement account or automatic contributions from your checking account to an investment account—is one of the most effective approaches to turning this theory into daily practice.

How much to save remains a more complex question. Chilton's 10%-of-income rule works as a starting point, but economists generally recommend saving less early in your career, when disposable income is more limited, and more later as your income increases. Some research has even suggested that young people shouldn't save at all in the early stages of their working lives. I don't have a firm opinion on this, as long as you have a concrete plan to achieve your long-term goals.

The Enemy in the Mirror

Once we've addressed the issue of saving, we can begin to think about investing itself. And this is where things get complicated, because investing is as much a psychological undertaking as it is a financial one. It involves risk and uncertainty about the future—issues that are somewhat quantifiable—but doing it well requires overcoming the countless behavioral biases that plague investors.

Benjamin Graham, one of the fathers of financial analysis and the investing profession as a whole, wrote it with surgical clarity: "The investor's greatest problem, and even his worst enemy, is probably himself." Graham, who mentored Warren Buffett at Columbia University, understood something fundamental: financial markets are designed to exploit our psychological weaknesses, from the fear of loss to unbridled greed, from the need to conform to the herd to the illusion of control.

The Four Most Expensive Words

John Templeton, mutual fund pioneer and legendary stock picker, summed up one of the most common mistakes with an iconic quote: "The four most expensive words in the English language are: This time is different." This quote is a powerful reminder: regardless of the objective realities of a situation, narratives can easily influence investment decisions.

During periods of extremely positive returns, investors seek explanations that not only justify the often exorbitant valuations of stocks, but also justify their continued growth. Consider periods like the dot-com bubble or, more recently, the price surge in Cathie Wood's ARKK ETF holdings. Many investors in those assets were buying stocks at historically abnormal valuations and were literally speaking the words Templeton had warned against: this time is different, the internet changes everything, artificial intelligence changes everything.

The story of ARKK is particularly instructive. In 2020, Cathie Wood's fund posted returns of over 150%, attracting a massive influx of capital from enthusiastic investors. But the decline was brutal: the fund lost approximately 80% from peak to trough, and even today, despite a recovery in 2025 with returns around 40%, it remains significantly below its all-time highs. The lesson? Valuations matter, sooner or later. They're the closest thing to gravity that exists in financial markets.

Fear and the Weight of History

The same phenomenon occurs when markets crash, but with the roles reversed. Economist Jeremy Siegel, author of the classic Stocks for the Long Run , wrote: "Fear has a stronger grip on human action than the sheer weight of historical evidence." I can endlessly tell you what historical data tells us about market crashes and subsequent recoveries, but that won't always be helpful when fear is in the air.

Investors create narratives about why markets won't recover this time because of whatever is causing the price decline. How many times have we heard the word "unprecedented" during COVID? It's important to recognize that each time we see extreme increases or decreases in asset prices, it's indeed different: the underlying causes and the narratives that accompany them are always unique, which is precisely why they cause such wild price swings.

What remains unchanged is that expected returns on risky assets are positive, and valuations matter, at least in the long run. Investors who want to capture expected returns over the long term must prepare mentally and financially for difficult times and hold assets that won't sell in a panic even when things don't go as expected. Market declines are never just abstract numbers on a screen: they are psychologically challenging moments that arise from deeply emotional and uncertain events. The COVID-19 pandemic wasn't just a market crash—it was potentially the end of life as we knew it.

Having a Philosophy and Sticking to It

One way to stay grounded during periods of extreme market conditions, in both directions, is to have conviction in your investment philosophy. David Booth, co-founder of Dimensional Fund Advisors—a fund management firm with a solid academic foundation—said, "The most important thing about an investment philosophy is having one you can stick to."

The insight here is profound. Financial markets have generally rewarded disciplined long-term investors, but many—if not most—sabotage their returns by switching in and out of investment strategies or styles at precisely the wrong times. Even an objectively suboptimal investment philosophy, such as dividend-focused investing, could be the optimal philosophy for some people if dividends help them maintain discipline.

The difficulty in sticking to an investment philosophy is that any strategy, no matter how solid its theoretical foundation, can seem flawed over long periods. ARKK is a good example again: when it was in its great bull run, I heard from many investors who had previously been disciplined in index funds that they were considering abandoning their entire investment philosophy because ARKK's narrative was so strong and its manager was directly targeting index funds.

Cathie Wood declared that flows into index funds represented "the most massive misallocation of capital in history" and that index funds were overweighting legacy companies at risk of disruption while underweighting the disruptors ARKK was targeting. For a while, it seemed she was right as ARKK skyrocketed, leaving cap-weighted index funds in the dust. But eventually, it came back down to earth, as tends to happen. Anyone who abandoned their index funds to chase ARKK's returns after it posted its massive gains got burned. And that was the experience of most investors in that fund.

But here's the interesting thing: ARKK investors who truly believed in that investment philosophy, who stuck with it since before Cathie Wood was all over the financial media thanks to ARKK's incredible short-term performance, and who didn't sell when it finally collapsed, have done just fine. I'm not endorsing that investment strategy—I don't think it makes any sense and I think it fundamentally misunderstands the relationship between technological innovation and stock returns—but the point is that belief in any investment philosophy will be tested over time. However, as long as it leads to a reasonably well-diversified and low-cost portfolio, having an investment philosophy you can stick to through good times and bad is probably far more important than having the perfect investment philosophy—which, unfortunately, doesn't really exist.

The Cost of (Upfront) Corrections

Even investors with a solid investment philosophy often become nervous about market corrections. They may consider switching to cash to avoid them or delaying investing new cash. Peter Lynch, the legendary manager of Fidelity's Magellan fund, which achieved an average annual return of 29% between 1977 and 1990, said: "Far more money has been lost by investors preparing for corrections or trying to anticipate them than has been lost in the corrections themselves."

This quote reminds us that while market declines can be painful—at least in the short term—history has shown that trying to time the market is rarely a winning strategy. Market crashes are temporary, but missed opportunities waiting for the perfect time to invest can have lasting consequences on your wealth.

What Is Risk Really?

Asset allocation is incredibly important because it calibrates the amount of risk you're taking on. One reason investors struggle with risk is that they don't really understand it. Risk is often discussed as volatility or the extent of short-term declines in asset values, but these are probably not the best measures for long-term investors.

Charles Ellis, author of Winning the Loser's Game , said, "Risk is not having the money you need when you need it." This simple definition captures the fact that risk can manifest itself either as the inability to finance short-term liquidity needs—highlighting the importance of planning for upcoming expenses, such as not investing in stocks with money you'll need tomorrow—or as the inability to finance future consumption, capturing the importance of earning sufficient expected returns to finance your inflation-adjusted spending in the distant future.

The curious thing is that an aversion to short-term volatility exposes investors to more extreme long-term risk. It is by assuming the risk of volatile assets that investors expect to earn higher returns in the long run. As Morgan Housel, author of the bestselling book The Psychology of Money , wrote: "Volatility is the price of admission to higher expected returns." Being unwilling or unable to assume the volatility of higher-expected-return assets like stocks can jeopardize your ability to achieve your long-term goals.

The Future is Unknown and Unknowable

Framing risk as the probability of running out of money emphasizes what long-term investors should really focus on. But even having the right focus doesn't mean you'll get the desired outcome. As good as we think our models are, the future is unknown and unknowable. And it's that unknown future we must plan for. Long-term theory and evidence can help point us in the right direction, but they still can't predict the future.

This doesn't just apply to investing. Life has a way of throwing curveballs, making it difficult to plan for every eventuality. Economist Elroy Dimson said, "Risk means that more things can happen than will." Every financial plan should take into account that we simply can't know the full range of future outcomes based on what has happened in the past or what we expect to happen in the future. Investors should maintain a healthy respect for the fact that things won't always go the way we want them to, no matter how much data we base our decisions on.

Beware of the Lions

The nature of risk and uncertainty makes investing and planning for the long term inherently awkward. Financial product manufacturers and active fund managers know that volatility is a problem for investors and are eager to sell solutions. Economist John Cochrane wrote: "When you dine with lions, make sure you're at the table, not on the menu."

If someone wants to sell you something—a stock or a financial product—you have to ask yourself why they want to sell it to you. What do they know that you don't? What's in it for them and what's in it for you? Are you entering into a mutually beneficial transaction, or are you about to be devoured alive by the lions of finance?

There are a plethora of financial products that prey on retail investors' fears and biases in exchange for ridiculously high fees and costs, thus putting retail investors on the back burner. Structured products tend to be among the most glaring examples, using complexity to hide extremely high implicit costs.

The Merciless Arithmetic of Costs

This is important because fees and costs are one of the few things investors can actually control. John Bogle, founder of Vanguard and creator of the world's first index fund, said: "The bitter irony of investing is that we investors as a group not only don't get what we pay for, we get precisely what we don't pay for."

Bogle is talking about the fact that, in aggregate, investors haven't benefited from paying higher fees to active fund managers aiming to beat the market. Instead, they've underperformed market indices by approximately the amount they've paid in fees. This is what Bill Sharpe, a Nobel Prize winner in economics, called "the arithmetic of active management": as a group, active funds must underperform passive funds because both groups capture the market, but active funds inherently have higher fees and costs.

This harsh reality cannot be avoided, but it is not always obvious. Investment is a discipline that, due to its inherent risk and uncertainty, contains a lot of noise. It is very difficult to be certain of anything in the financial markets, except that there will be a lot of uncertainty.

The Only Free Lunch

One of the most dangerous characteristics of an investor is overconfidence. Whenever you think you're sure of something—real estate will always go up, this cryptocurrency will go to the moon, tech stocks will always beat the market, the US market will always outperform—you need to take a step back and remember that the only certainty in investing is uncertainty. It's always worth asking yourself what happens if you're wrong.

One of the best ways to demonstrate humility in investing is through diversification. If you go all in on a single stock and get it wrong, you could permanently jeopardize your capital. It's not uncommon for individual stocks to drop 60% or more and never recover. If you hold a broadly diversified portfolio of stocks, the risk of permanent capital loss or total loss is significantly reduced.

Harry Markowitz, Nobel Prize winner in economics and father of modern portfolio theory, is paraphrased as saying, "Diversification is the only free lunch in investing." Typically, as mentioned above, volatility is the price of admission to higher expected returns. But diversification is a rare case where combining multiple, imperfectly correlated risky assets in a portfolio can allow you to increase expected returns without increasing risk, or decrease risk without decreasing expected returns.

Diversification also mitigates the damage if a single portfolio investment fails and makes you more likely to hold the rare big winners that drive most market returns. The downside of diversification is that it makes you less likely to hit big home runs. But because of the asymmetry in individual stock returns—that is, the fact that most stocks perform poorly while relatively few perform exceptionally well—you're much more likely to choose losing stocks than big winners.

As John Bogle said, "Don't look for a needle, buy a haystack."

The Principles That Remain

All these quotes boil down to a few key principles that every investor—whether short-, medium-, or long-term—should internalize. Spend less than you earn. Keep enough cash for short-term expenses and invest the rest in a risk-appropriate portfolio with expected returns sufficient to achieve your long-term goals. Choose an investment philosophy and asset allocation that you can stick to even when they don't seem to work. Don't try to time the market. Be prepared for the future to be different from your current expectations. Be aware of your fees and costs. Don't be overconfident about anything. And diversify widely.

These are simple principles, almost banal in their formulation. But it's precisely this simplicity that makes them so difficult to follow when markets skyrocket and everyone around you seems to be getting rich off the latest fad, or when markets crash and every fiber of your being screams at you to sell everything and run for cover. In those moments, the words of great investors become anchors: they don't solve problems, but they remind you that you are part of a greater tradition, that others before you have faced the same challenges and overcome them, and that discipline—however painful—has always been rewarded in the long run.

Warren Buffett, who at 94 announced in May 2025 his retirement from the operational leadership of Berkshire Hathaway after sixty years at the helm, transformed a $1,000 investment in 1965 into approximately $33 million today. He didn't do it by chasing the latest trends or timing the markets, but by applying with iron discipline the principles we've explored: patience, humility, diversification, cost-consciousness, and, above all, a clear investment philosophy to which he has remained faithful for decades.

The final lesson, perhaps, is precisely this: in investing, as in life, it's not individual brilliant decisions that make the difference, but the ability to consistently make sound choices, year after year, resisting the sirens of speculation and panic. Quotes from great investors won't make you rich by themselves, but they can provide the moral and intellectual compass you'll need when the going gets tough. And, if there's one certainty in the markets, it's that sooner or later the going will get tough.