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But it is the bane of psychology to suppose that where results are similar, processes must be the same. Psychologists are too apt to reason as geometers would, if the latter were to say that the diameter of a circle is the same thing as its semi-circumference, because, forsooth, they terminate in the same two points.
William James
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Interpretation

What this quote means

Similar results do not necessarily mean similar processes in psychology.

William James highlights a critical error in psychology: assuming that similar outcomes equate to identical underlying processes. By comparing psychological reasoning to geometric reasoning, he underscores the complexity of human behavior and warns against oversimplification in the study of the mind.

Themes

PsychologyProcessesSimilarityComplexityUnderstanding

In practice

Example use cases

This quote could be used in a psychology class to emphasize the importance of understanding different psychological processes.

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Many persons nowadays seem to think that any conclusion must be very scientific if the arguments in favor of it are derived from twitching of frogs' legs (especially if the frogs are decapitated) and that, on the other hand, any doctrine chiefly vouched for by the feelings of human beings (with heads on their shoulders) must be benighted and superstitious.
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The lunatic's visions of horror are all drawn from the material of daily fact. Our civilization is founded on the shambles, and every individual existence goes out in a lonely spasm of helpless agony.
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As there is no worse lie than a truth misunderstood by those who hear it, so reasonable arguments, challenges to magnanimity, and appeals to sympathy or justice, are folly when we are dealing with human crocodiles and boa-constrictors.
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Quote by William James | QuoteProject