Mankind suffers from two excesses: to exclude reason, and to live by nothing but reason.

To call a king "Prince" is pleasing, because it diminishes his rank.

Happiness can be found neither in ourselves nor in external things, but in God and in ourselves as united to him.

Those who are accustomed to judge by feeling do not understand the process of reasoning, because they want to comprehend at a glance and are not used to seeking for first principles. Those, on the other hand, who are accustomed to reason from first principles do not understand matters of feeling at all, because they look for first principles and are unable to comprehend at a glance.

If man should commence by studying himself, he would see how impossible it is to go further.

Look for the truth, it wants to be found.

I can readily conceive of a man without hands or feet; and I could conceive of him without a head, if experience had not taught me that by this he thinks, Thought then, is the essence of man, and without this we cannot conceive of him.