No one is ignorant that there are two avenues by which opinions are received into the soul, which are its two principal powers: the understanding and the will.

Nature is an infinite sphere of which the center is everywhere and the circumference nowhere.

We should seek the truth without hesitation; and, if we refuse it, we show that we value the esteem of men more than the search for truth.

Jesus Christ came to tell men that they have no enemies but themselves.

We do not worry about being respected in towns through which we pass. But if we are going to remain in one for a certain time, we do worry. How long does this time have to be?

All our life passes in this way: we seek rest by struggling against certain obstacles, and once they are overcome, rest proves intolerable because of the boredom it produces.

Piety is different from superstition. To carry piety to the extent of superstition is to destroy it. The heretics reproach us with this superstitious submission. It is doing what they reproach us with.