"When we find ourselves unable to reason (as one often does when presented with, say, a problem in algebra) it is because our imagination is not touched. One can begin to reason only when a clear picture has been formed in the imagination. Bad teaching is teaching which presents an endless procession of meaningless signs, words and rules, and fails to arouse the imagination."

Source : W. W. Sawyer (2012). “Mathematician's Delight”, p.32, Courier Corporation

W. W. Sawyer

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