Advice on writing
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C. S. Lewis
Eight rules C. S. Lewis sent to an American schoolgirl who had written, at her teacher’s suggestion, to ask how to write. Swap the radio and the typewriter for their modern equivalents and nothing here has aged; rule 5 applies to code as much as to prose.

Source: Letters of C. S. Lewis, edited by W. H. Lewis (letter of 14 December 1959).