All our knowledge begins with the senses...

But although all our knowledge begins with experience, it does not follow that it arises from experience.

Human reason has the peculiar fate in one species of its cognitions that it is burdened with questions which it cannot dismiss, since they are given to it as problems by the nature of reason itself, but which it also cannot answer, since they transcend every capacity of human reason.

Maximum individuality within maximum community

There is nothing higher than reason.

I learned to honor human beings, and I would find myself far more useless than the common laborer if I did not believe that this consideration could impart to all others a value establishing the rights of humanity.

When I could have used a wife, I could not support one; and when I could support one, I no longer needed any