People are zealous for a cause when they are not quite positive that it is true.

It is in our hearts that evil lies, and it is from our hearts that it must be plucked out.

If you wish to be happy yourself, you must resign yourself to seeing others also happy.

The scientific attitude of mind involves a sweeping away of all other desires in the interest of the desire to know.

(on A History of Western Philosophy) I was sometimes accused by reviewers of writing not a true history but a biased account of the events that I arbitrarily chose to write of. But to my mind, a man without a bias cannot write interesting history - if, indeed, such man exists.

The three main extra-rational activities in modern life are religion, war, and love. all these are extra-rational, but love is not anti-rational, that is to say, a reasonable man may reasonably rejoice in its existence

Orthodoxy is the grave of intelligence, no matter what orthodoxy it may be.