Few friendships would survive if each one knew what his friend says of him behind his back.

Meanings receive their dignity from words instead of giving it to them.

Reverend Fathers, my letters did not usually follow each other at such close intervals, nor were they so long.... This one would not be so long had I but the leisure to make it shorter.

It is not possible to have reasonable grounds for not believing in miracles.

To find recreation in amusements is not happiness; for this joy springs from alien and extrinsic sources, and is therefore dependent upon and subject to interruption by a thousand accidents, which may minister inevitable affliction.

Those are weaklings who know the truth and uphold it as long as it suits their purpose, and then abandon it.

It is not from space that I must seek my dignity, but from the government of my thought. I shall have no more if I possess worlds. By space the universe encompasses and swallows me up like an atom; by thought I comprehend the world.