“When children are doing nothing, they are doing mischief.”
Book XV, Ch. 2
The History of Tom Jones (1749)
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Henry Fielding 70
English novelist and dramatist 1707–1754Related quotes

“It is intolerable that it should be in the power of one blockhead to do so much mischief.”
Fox on George III in a letter to Mr. Fitzpatrick (9 September 1781), quoted in John Brooke, George III (Panther, 1974), pp. 363-364.
1780s

“Smile with an intent to do mischief, or cozen him whom he salutes.”
The Anatomy of Melancholy (1621), Democritus Junior to the Reader

“The worst thing you can do is nothing. (re: teaching children with autism)”

“The pro-life Republicans drop the children at birth and do nothing for them after that.”
Source: http://groups.csail.mit.edu/mac/users/rauch/no-violence/civil/hentoff_casey.html
“When you have something to do, do it. When you have nothing to do, sleep.”
Source: The Heritage Universe, Resurgence (2002), Chapter 4, “Sleepless in Miranda Port” (p. 33)