A belief is not true simply because it is useful.
From every spot on earth we are equally near heaven and the infinite.
To be always ready a man must be able to cut a knot, for everything cannot be untied.
Philosophy means the complete liberty of the mind, and therefore independence of all social, political or religious prejudice... It loves one thing only... truth.
Society rests upon conscience, not upon science.
Self-interest is an inexhaustible source of convenient illusions. The number of beings who wish to see truly is extraordinarily small.