The belief that youth is the happiest time of life is founded upon a fallacy. The happiest person is the person who thinks the most interesting thoughts, and we grow happier as we grow older.

The future is completely open, and we are writing it moment to moment.

Only a life lived for others is a life worthwhile.

Intense love does not measure; it just gives.

I am not an optimist, but a great believer of hope.

Do not grow old, no matter how long you live. Never cease to stand like curious children before the Great Mystery into which we were born.

Individual differences are the foundation of progress.