A railroad is like a lie you have to keep building it to make it stand.

I have been studying the traits and dispositions of the "lower animals" (so called) and contrasting them with the traits and dispositions of man. I find the result humiliating to me.

Some men worship rank, some worship heroes, some worship power, some worship God, and over these ideals they dispute-but they all worship money.

It's a good thing for a dog to have fleas; keeps his mind off being a dog.

There is no security in life, only opportunity.

We regret the things we don't do more than the things we do.

A powerful agent is the right word: it lights the reader's way and makes it plain.