Ignorance is curable, stupid is forever.

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About Robert A. Heinlein

Robert Anson Heinlein (7 July 1907 – 8 May 1988) was one of the most popular, influential, and controversial authors of science fiction of the 20th Century.

Biography information from Wikiquote

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Additional quotes by Robert A. Heinlein

From somewhere, back in my youth, heard Prof say, 'Manuel, when faced with a problem you do not understand, do any part of it you do understand, then look at it again.' He had been teaching me something he himself did not understand very well — something in math — but had taught me something far more important, a basic principle.