Never tease an old dog; he might have one bite left.

Brainpower is the scarcest commodity and the only one of real value.

The more you love, the more you can love--and the more intensely you love. Nor is there any limit on how many you can love. If a person had time enough, he could love all of that majority who are decent and just.

I don't trust a man who talks about ethics when he is picking my pocket. But if he is acting in his own self-interest and says so, I have usually been able to work out some way to do business with him.

People who are busy and happy don't write diaries; they are too busy living.

Why do some people act as if making money offended their delicate minds? I am out for a legitimate profit, and not ashamed of it; the fact that people will pay money for my goods and services shows that my work is useful.

You can't conquer a free man; the most you can do is kill him.