Think of a hypothesis as a card. A theory is a house made of hypotheses.

Geometry is beautifully logical, and it teaches you how to think and prove that things are so, step by step by step. Proofs are excellent lessons in reasoning. Without logic and reasoning, you are dependent on jumping to conclusions or - worse - having empty opinions.

You're who you think you are, even if you never admit it to yourself or to anyone else. You may be in the worst position to judge, but you're in the best position to know.

The difference between America and England is that the English think 100 miles is a long distance and the Americans think 100 years is a long time. The difference between an autobiography and an unauthorized biography is like the difference between an account of your life written by your mother and one written by your mother-in-law.

Be able to live alone, even if you don't want to and think you will never find it necessary.