Most men's friendships are too inarticulate.

The greatest discovery of the 20th Century is that our attitude of mind determines our quality of life, not circumstances.

It is only by risking our persons from one hour to another that we live at all.

...By far the most usual way of handling phenomena so novel that they would make for a serious rearrangement of our preconceptions is to ignore them altogether, or to abuse those who bear witness for them.

Science as such assuredly has no authority, for she can only say what is, not what is not.

Any object not interesting in itself may become interesting through becoming associated with an object in which an interest already exists. The two associated objects grow, as it were, together; the interesting portion sheds its quality over the whole; and thus things not interesting in their own right borrow an interest which becomes as real and as strong as that of any natively interesting thing.

The history of philosophy is to a great extent that of a certain clash of human temperaments.