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I think self-knowledge is the rarest trait in a human being.

Knowledge has value only insofar as it contributes to the all-round development of the whole nature of man.

To have real knowledge, one must understand the essence of things and not only their manifestations.

Knowledge is knowing that we cannot know.

The only source of knowledge is experience.

Knowledge is the life of the mind.

It may, however, be said that the level of experience to which concepts are inapplicable cannot yield any knowledge of a universal character, for concepts alone are capable of being socialized.

Knowledge is love and light and vision.