Premature optimization is the root of all evil.

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Source, in full

Quote due to Donald Knuth, "Structured Programming with Goto Statements", Computing Surveys 6:4 (December 1974), pp. 261–301, §1. Knuth refers to it as "Hoare's Dictum" 15 years later in "The Errors of TeX", Software—Practice & Experience 19:7 (July 1989), pp. 607–685. However, the attribution to Hoare is doubtful.

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Attribution

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