“Everybody is wrong about everything, just about all the time.”

Speech at the University of Pennsylvania (6 May 1964)

Wasting Time.
Song lyrics, On and On (2003)

Source: Every Fifteen Minutes

from the song "How Soon Is Now?"
From songs

Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%.
Variant in Knuth, "Structured Programming with Goto Statements" http://pplab.snu.ac.kr/courses/adv_pl05/papers/p261-knuth.pdf. Computing Surveys 6:4 (December 1974), pp. 261–301, §1.
Knuth refers to this 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 C. A. R. Hoare is doubtful. http://shreevatsa.wordpress.com/2008/05/16/premature-optimization-is-the-root-of-all-evil/
All three of these papers are reprinted in Knuth, Literate Programming, 1992, Center for the Study of Language and Information ISBN 0937073806
Source: Computer Programming as an Art (1974), p. 671

El hombre habla de todo y habla de todo como si el conocimiento de todo estuviese todo en él.
Voces (1943)

Source: Bad Astronomy (2002), p. 19

Source: Pollyanna