“Stupid fools look just as good as military geniuses until the fighting starts.”
Source: Friday (1982), Chapter 4 (p. 37)
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Robert A. Heinlein 557
American science fiction author 1907–1988Related quotes

“Military intelligence was as nothing to military stupidity.”
Source: Vorkosigan Saga, Diplomatic Immunity (2002), Chapter 2 (p. 32)

“You can't start a diet in the middle of the week, that's just stupid.”
From The Jay Leno Show, November 2009
“58: Fools ignore complexity. Pragmatists suffer it. Some can avoid it. Geniuses remove it.”
Epigrams on Programming, 1982
“To let a fool kiss you is stupid,
To let a kiss fool you is worse.”
"Inscription On A Lipstick" in The Garment Worker Vol. 41 (1941), p. 10.

About José Mourinho.
We don't need to give away flags for our fans to wave (2012)

Better Way.
Song lyrics, Both Sides of the Gun (2006)