“Experience without theory is blind, but theory without experience is mere intellectual play.”
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Happiness is not an ideal of reason, but of imagination.
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.
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.
What can I know? What ought I to do? What can I hope?