Rationality is not just something you do so that you can make more money, it is a binding principle. Rationality is a really good idea. You must avoid the nonsense that is conventional in one's own time. It requires developing systems of thought that improve your batting average over time.

Spend each day trying to be a little wiser than you were when you woke up.

Finding a single investment that will return 20% per year for 40 years tends to happen only in dreamland. In the real world, you uncover an opportunity, and then you compare other opportunities with that. And you only invest in the most attractive opportunities. That's your opportunity cost. That's what you learn in freshman economics. The game hasn't changed at all. That's why Modern Portfolio Theory is so asinine.

I think that, every time you saw the word EBITDA, you should substitute the word "bullshit" earnings.

We've had the most massive creation of wealth for people a lot younger than those who formerly got wealth in the history of the world. The world is full of young people who really want to get rich, and when I left school nobody thought it was a reasonable possibility.

People have always had this craving to have someone tell them the future. Long ago, kings would hire people to read sheep guts. There's always been a market for people who pretend to know the future. Listening to today's forecasters is just as crazy as when the king hired the guy to look at the sheep guts.

I think that one should recognize reality even when one doesn't like it; indeed, especially when one doesn't like it.