Knowing the edge of your competency is important. If you think you know more than you do, you will get in trouble.

It's easier to resist at the beginning than at the end.

What the wise do in the beginning, fools do in the end.

It's good to learn from your mistakes. It's better to learn from other people's mistakes.

Don't risk what is important to you, to get what is not important to you.

Everybody's got a different circle of competence. The important thing is not how big the circle is. The important thing is staying inside the circle.