A friend is someone who stays by your side all through the troubles he's caused you.

The chess player who develops the ability to play two dozen boards at a time will benefit from learning to compress his or her analysis into less time.

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.

[Adulthood:] It's when you stop doing the stuff you have to make excuses for and when you stop making excuses for the stuff you have to do.

Be able to correctly pronounce the words you would like to speak and have excellent spoken grammar.

I've never found an interesting person with a foul mouth.

Know how weather, especially humidity, can affect the movement of doors and windows.