Upon the solution of this problem, or upon sufficient proof of the impossibility of synthetical knowledge a priori, depends the existence or downfall of metaphysics.

The death of dogma is the birth of morality.

Thoughts without content are empty, intuitions without concepts are blind.

With men, the state of nature is not a state of peace, but war.

There is something splendid about innocence; but what is bad about it, in turn, is that it cannot protect itself very well and is easily seduced.

All human knowledge begins with intuitions, proceeds from thence to concepts, and ends with ideas.

The busier we are, the more acutely we feel that we live, the more conscious we are of life.