"Never think that you already know all. However highly you are appraised, always have the courage to say to yourself-I am ignorant."
"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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Source: Ivan Petrovich Pavlov, G. V. Anrep (2003). “Conditioned Reflexes”, p.3, Courier Corporation
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