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For Aristotelian physics the membership of an object in a given class was of critical importance, because for Aristotle the class defined the essence or essential nature of the object, and thus determined its behavior in both positive and negative respects.

— Kurt Lewin p. 143 Donald P. Spence (1994)

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More quotes by Kurt Lewin

A business man once stated that there is nothing so practical as a good theory.

It is not the similarity or dissimilarity of individuals that constitutes a group, but interdependence of fate.

Kurt Lewin (1939)

A goal can play an essential role in the psychological situation without being clearly present in consciousness.

Only by the concrete whole which comprises the object and the situation are the vectors which determine the dynamics of the event defined.

The study of the conditions for change begins appropriately with an analysis of the conditions for “no change,” that is, for the state of equilibrium.

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Quote text and notes from Wikiquote: Kurt Lewin (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.