Childhood is a short season.

The formula for success: rise early, work hard, strike oil.

I have never in my life learned anything from any man who agreed with me.

Each day is the scholar of yesterday.

No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

Immorality: the morality of those who are having a better time.

There are no shortcuts in evolution.

Hope is the only bee that makes honey without flowers.

Principles have no real force except when one is well-fed.