There is nothing higher than reason.
The busier we are, the more acutely we feel that we live, the more conscious we are of life.
There can be no doubt that all our knowledge begins with experience.
The science of mathematics presents the most brilliant example of how pure reason may successfully enlarge its domain without the aid of experience
I had therefore to remove knowledge, in order to make room for belief.
The possession of power inevitably spoils the free use of reason.