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Science demands from a man all his life. If you had two lives that would not be enough for you. Be passionate in your work and in your searching.
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Men are apt to be much more influenced by words than by the actual facts of the surrounding reality.
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Learn, compare, collect the facts!
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Learn the ABC of science before you try to ascend to its summit.
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Perfect as the wing of a bird may be, it will never enable the bird to fly.
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Never think that you already know all. However highly you are appraised, always have the courage to say to yourself-I am ignorant.
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While you are experimenting, do not remain content with the surface of things.
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Do not become archivists of facts. Try to penetrate to the secret of their occurrence, persistently search for the laws which govern them.
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Mankind will possess incalculable advantages and extraordinary control over human behavior when the scientific investigator will be able to subject his fellow men to the same external analysis he would employ for any natural object, and when the human mind will contemplate itself not from within but from without.
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It is still open to question whether psychology is a natural science, or whether it can be regarded as a science at all.
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Don't become a mere recorder of facts, but try to penetrate the mystery of their origin.