Promise me you'll always remember: You're braver than you believe, and stronger than you seem, and smarter than you think.

An intelligent person is never afraid or ashamed to find errors in his understanding of things.

Smartness runs in my family. When I went to school I was so smart my teacher was in my class for five years.

What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.

Being an intellectual creates a lot of questions and no answers.