That we must love one God only is a thing so evident that it does not require miracles to prove it.

[On vanity:] The nose of Cleopatra: if it had been shorter, the face of the earth would have changed.

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.

Admiration spoils all from infancy.

I feel engulfed in the infinite immensity of spaces whereof I know nothing, and which know nothing of me, I am terrified The eternal silence of these infinite spaces alarms me.

All our troubles come from not being able to be alone.

True eloquence makes light of eloquence. True morality makes light of morality.