He who can be, and therefore is, another's, and he who participates in reason enough to apprehend, but not to have, is a slave by nature.

He who will not reason, is a bigot; he who cannot is a fool; and he who dares not is a slave.

Every action must be due to one or other of seven causes: chance, nature, compulsion, habit, reasoning, anger, or appetite.

All human actions have one or more of these seven causes : chance, nature, compulsion, habit, reason, passion, desire.

For as the eyes of bats are to the blaze of day, so is the reason in our soul to the things which are by nature most evident of all.

The search for truth is in one way hard and in another way easy, for it is evident that no one can master it fully or miss it wholly. But each adds a little to our knowledge of nature, and from all the facts assembled there arises a certain grandeur.