Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch ...
A bird doesn't sing because it has an answer, it sings because it has a song.
You can tell more about a person by what he says about others than you can by what others say about him.
An ounce of action is worth a ton of theory.
The man who removes a mountain begins by carrying away small stones.