No man will work for your interests unless they are his.

Intellectual comradeship requires that you think your thoughts through to the place where you can make the complex seem simple, the obscure quite clear.

Good humor isn't a trait of character, it is an art which requires practice.

Try out your ideas by visualizing them in action.

Modern science knows much about such conflicts. We call the mental state that engenders it "ambivalence": a collision between thought and feeling.

Tell a man something is bad, and he's not at all sure he wants to give it up. Describe it as stupid, and he knows it's the better part of caution to listen.

We learn courageous action by going forward whenever fear urges us back.