Act that your principle of action might safely be made a law for the whole world.

Out of the crooked timber of humanity, no straight thing was ever made.

How then is perfection to be sought? Wherein lies our hope? In education, and in nothing else.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

Riches ennoble a man's circumstances, but not himself.

We assume a common sense as the necessary condition of the universal communicability of our knowledge, which is presupposed in every logic and every principle of knowledge that is not one of skepticism.

The possession of power inevitably spoils the free use of reason.