If you never heard opportunity knock, maybe you're never at home.

Stop asking for directions so much. Assuming that you're in a safe environment, pay attention and figure things out for yourself. Have the nerve to take a wrong turn now and then. You'll develop better working instincts and have more self-esteem too.

People who work crossword puzzles know that if they stop making progress, they should put the puzzle down for a while.

The length of your education is less important than its breadth, and the length of your life is less important than its depth.

I believe a 'talented' person is one who has learned how to effectively cultivate and polish any of the many desirable capabilities with which most of us are born but few of us nurture.

Be able to defend your arguments in a rational way. Otherwise, all you have is an opinion.

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.