"Imagination consists in expelling from reality several incomplete persons, and then using the magic and subversive powers of desire to bring them back in the form of one entirely satisfying presence."

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One need not be eminent in any part of profound knowledge in order to understand it and to apply it. The various segments of the system of profound knowledge cannot be separated. They interact with each other. For example knowledge about psychology is incomplete without knowledge of variation.

— W. Edwards Deming