It is all very well to talk about being the captain of your soul. It is hard, and only a few heroes, saints, and geniuses have been the captains of their souls for any extended period of their lives.

There is nothing so bad but it can masquerade as moral.

A really good diplomat does not go in for victories, even when he wins them.

The radical novelty of modern science lies precisely in the rejection of the belief... that the forces which move the stars and atoms are contingent upon the preferences of the human heart.

We forge gradually our greatest instrument for understanding the world - introspection. We discover that humanity may resemble us very considerably - that the best way of knowing the inwardness of our neighbors is to know ourselves.

What each man does is based not on direct and certain knowledge, but on pictures made by himself or given to him...

The only feeling that anyone can have about an event he does not experience is the feeling aroused by his mental image of that event ... For it is clear enough that under certain conditions men respond as powerfully to fictions as they do to realities.