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Selective breeding can alter man's capacity to learn, to keep sane, to cherish justice or to be happy. There is no more certain and economical a way to improve man's environment as to improve his nature.

— Edward Thorndike Edward Thorndike (1913)

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The intellectual evolution of the race consists in an increase in the number, delicacy, complexity, permanence and speed of formation of such associations.

If we (researchers) should keep the environment of boys and girls absolutely similar these instincts would produce sure and important differences between the mental and moral activities of boys and girls.

Edward Thorndike (1914)

Psychology is the science of the intellects, characters and behavior of animals including man. Human education is concerned with certain changes in the intellects, characters and behavior of men, its problems being roughly included under these four topics: Aims, materials, means and methods.

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