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

Even philosophers will praise war as ennobling mankind, forgetting the Greek who said: 'War is bad in that it begets more evil than it kills'.

Experience without theory is blind, but theory without experience is mere intellectual play.

From such crooked wood as that which man is made of, nothing straight can be fashioned.

Happiness is not an ideal of reason, but of imagination.

Have patience awhile; slanders are not long-lived. Truth is the child of time; erelong she shall appear to vindicate thee.

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.

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

I have no knowledge of myself as I am, but merely as I appear to myself.

I ought never to act except in such a way that I could also will that my maxim should become a universal law.