Immaturity is the incapacity to use one's intelligence without the guidance of another.

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

I had therefore to remove knowledge, in order to make room for belief.

Science is organized knowledge. Wisdom is organized life.

It is beyond a doubt that all our knowledge that begins with experience.

Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowledge.

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

He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.

Religion is the recognition of all our duties as divine commands.

Science is organized knowledge. Wisdom is organized life.