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Men act like brutes in so far as the sequences of their perceptions arise through the principle of memory only, like those empirical physicians who have mere practice without theory.

The increase of scientific knowledge lies not only in the occasional milestones of science, but in the efforts of the very large body of men who with love and devotion observe and study nature.

Man can learn nothing except by going from the known to the unknown.

To know a man, observe how he wins his object, rather than how he loses it; for when we fail, our pride supports us - when we succeed, it betrays us.

Nature is relentless and unchangeable, and it is indifferent as to whether its hidden reasons and actions are understandable to man or not.

We live at a time when man believes himself fabulously capable of creation, but he does not know what to create.

Man is a creative retrospection of nature upon itself.

All men by nature desire knowledge.

If we want to make a statement about a man's nature on the basis of his physiognomy, we must take everything into account; it is in his distress that a man is tested, for then his nature is revealed.

A man can only attain knowledge with the help of those who possess it. This must be understood from the very beginning. One must learn from him who knows.