The late Charlie Munger made his fortune in markets, but the mental discipline underneath it traces straight back to ancient Stoicism. Marcus Aurelius, Seneca, and Epictetus built an entire philosophy on one premise: that suffering comes less from events themselves and more from how a person reacts to them. Munger landed in the same place from a completely different direction, through decades of running Berkshire Hathaway beside Warren Buffett.
He even said so directly. Describing how to handle life’s unfair blows, Munger once told an audience that “the attitude of Epictetus is the best.” Pull apart his interviews, his Daily Journal, and Wesco shareholder letters, along with his old speeches, and a pattern shows up again and again: ten habits he refused to let anywhere near his thinking and warned others about, each one matched by a Stoic idea that came nearly two thousand years before him.
Let’s look at ten things people with a stoic mindset don’t waste time on.
1. Envy
Munger treated envy as the most useless of all human vices. It produces nothing in return, no pleasure, no advantage. Epictetus made the same point from the opposite angle, teaching that envy hands control of your emotional state to someone else’s circumstances.
Munger called envy “a really stupid sin” because, unlike most vices, it offers a person no enjoyment at all. Marcus Aurelius offered the antidote centuries earlier: “Do not indulge in dreams of having what you have not.” Greed at least delivers a thrill. Envy delivers pain.
2. Resentment
Resentment keeps an old grievance alive long after the event itself has ended. The Stoics held that the past is beyond anyone’s control, so getting angry at it accomplishes nothing. Epictetus framed the deeper issue this way: “Men are disturbed not by the things which happen, but by their opinions.”
Munger grouped this habit with three others he considered equally damaging. “Envy, resentment, revenge, and self-pity are disastrous modes of thought,” he said. He treated the whole group as basic mental hygiene, something to clear out the same way a person avoids food that has gone bad.
3. Revenge
Where resentment stews internally, revenge spends real energy trying to settle a score with someone else. Marcus Aurelius offered the clean answer almost two thousand years ago: “The best revenge is to be unlike him who performed the injury.” Don’t mirror the offense. Outgrow it instead.
Munger saw the same waste from a business angle. For a man whose entire career depended on compounding, every hour spent plotting payback was an hour stolen from something that actually built business for investment value.
4. Self-Pity
A Stoic accepts that life deals out unfair hands and asks only one question afterward, which is what the next useful step should be. Epictetus put it in practical terms: “Make the best use of what is in your power.”
Munger lived through a difficult divorce and the death of his nine-year-old son to leukemia. He later lost an eye to a botched surgery. Through it all, he warned against the one habit he considered hardest to undo. “Self-pity gets fairly close to paranoia,” he said, and in his experience, paranoia rarely reverses itself once it takes hold.
5. Fretful Worrying and Over-Anxiety
Stoics draw a hard line between what is within a person’s control, such as preparation, and what isn’t, such as outcomes. Epictetus opened his entire handbook on that idea: “Of things some are in our power, and others are not.”
Munger applied the same split to temperament rather than philosophy. “Most people are too fretful; they worry too much. Success means being very patient, but aggressive when it’s time,” he said. A calm mind, in his experience, beats a high IQ paired with constant anxiety almost every time.
6. Social Proof and Blind Conformity
The Stoics called it doxa, the shifting opinion of the crowd, and warned that borrowed beliefs make an unstable foundation for living well. Epictetus went further, arguing that a person should welcome the crowd’s disapproval rather than fear it: “If you want to improve, be content to be thought foolish and stupid.”
Munger studied the same tendency from a psychological angle and gave it a name: social proof, the habit of copying what other people do to feel safe inside a group. “Mimicking the herd invites regression to the mean,” he said. Facts and reasoning decide whether an idea is right. The crowd doesn’t get a vote.
7. Pretending to Know Things You Don’t
Admitting ignorance carries a social cost, so most people fake confidence instead of saying three honest words: I don’t know. Marcus Aurelius pushed in the opposite direction. “Waste no more time arguing about what a good man should be. Be one.”
Munger credited a large share of his success to staying within his own circle of competence rather than performing beyond his expertise. “Trying to be consistently not stupid, instead of trying to be very intelligent,” he said, was where most of the real advantage came from.
8. Defending Outdated, Broken Ideas
When new facts arise, a Stoic updates their belief rather than defending it out of pride. Marcus Aurelius wrote that he welcomed correction rather than resisting it: “I seek the truth, which never harmed anyone.”
Munger compared the same instinct to a card table. “You have to learn to quit sometimes when holding a much-loved hand,” he said of decision-making under new information. Protecting an outdated belief to avoid admitting error wastes the one asset that actually compounds: clear thinking.
9. Demanding Shortcuts and Getting Rich Quick
The urge to skip ahead and find a shortcut is, in Stoic terms, a refusal to accept the relationship between effort and result. Marcus Aurelius offered a one-line correction: “Confine yourself to the present.”
Munger built his entire reputation on the opposite of shortcuts. “Spend each day trying to be a little wiser than you were,” he advised, and progress, in his model, happens one inch at a time. Munger warned, “The desire to get rich fast is pretty dangerous.” The people chasing a faster path usually end up further behind the ones willing to do the work.
10. Chasing Complex Solutions Over Basic Truths
Many people assume a complicated strategy must be smarter than a simple one, so they spend years building systems that eventually collapse under their own weight. Marcus Aurelius argued for the opposite approach to life generally: “Very little is needed to make a happy life.”
Munger ran his entire investing career on the same minimalism. “We have three baskets for investing: yes, no, and too tough to understand,” he said, and refused to force a decision on anything that didn’t clearly belong in the first two. A handful of basic ideas, mastered completely, beat complexity almost every time.
Conclusion
Munger tied all of this together using a method borrowed from the mathematician Carl Jacobi, who advised, “Invert, always invert.” He said inverting problems and studying them backward. Rather than designing the perfect life directly, he built something closer to an anti-to-do list, spending his energy avoiding these ten traps rather than chasing a polished version of success.
That approach aligns with the philosophy Marcus Aurelius, Seneca, and Epictetus handed down centuries earlier. A well-lived life depends less on what a person adds to it and more on what they refuse to let in. Munger spent a lifetime proving the point, one avoided trap at a time.