"You can't ever be 100% sure of anything." - Steve Schwarzman, self-made multibillionaire founder of Blackstone Investments.
"Every day I assume every position I have is wrong." - Paul Tudor Jones, self-made multibillionaire hedge fund manager.
"For investors as a whole, returns decrease as motion increases." - Buffett
"You don't need to be a rocket scientist. Investing is not a game where the guy with the 160 IQ beats the guy with 130 IQ." - Buffett