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

Justice is what is established; and thus all our established laws will necessarily be regarded as just without examination, since they are established.

The present letter is a very long one, simply because I had no leisure to make it shorter.

We view things not only from different sides, but with different eyes; we have no wish to find them alike.

One must know oneself. If this does not serve to discover truth, it at least serves as a rule of life and there is nothing better.

All our reasoning boils down to yielding to sentiment.

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.