In each of us there is a little of all of us.

When an acquaintance goes by I often step back from my window, not so much to spare him the effort of acknowledging me as to spare myself the embarrassment of seeing that he has not done so.

We cannot remember too often that when we observe nature, and especially the ordering of nature, it is always ourselves alone we are observing.

The writer who cannot sometimes throw away a thought about which another man would have written dissertations, without worry whether or not the reader will find it, will never become a great writer.

Do not say hypothesis, and even less theory: say way of thinking.

You can make a good living from soothsaying but not from truthsaying.

The fruits of philosophy are the important thing, not the philosophy itself. When we ask the time, we don't want to know how watches are made.