Never owe any money you can’t pay tomorrow morning. Never let the markets dictate your actions. Always be in a position to play your own game.

Le preguntaron a Warren Buffet: What are the key lessons you took from the financial crisis?
"They are not new lessons. Never owe any money you can’t pay tomorrow morning. Never let the markets dictate your actions. Always be in a position to play your own game. Never take on more risks than you can handle…Good businesses, good management, plenty of liquidity, always having a loaded gun; if you play by those principles you will do fine no matter what happens. And you don’t ever know what’s going to happen…
I mean, when times are good, it is kind of like Cinderella at the ball. She knew at midnight that everything was going to turn into pumpkins and mice, but it was just so much damn fun, dancing there, the guys looked better and the drinks got more frequent and there were no clocks on the wall.
And that’s what happened with capitalism. We have a lot of fun as the bubble blows up, and we all think we are going to get out five minutes before midnight, but there are no clocks on the wall."

Vía signal vs noise, blog de 37 signals.