“One may well use one’s head even though one is in love. Someone has said that one cannot prevent lightening from striking – but one may prevent the whole town from burning down.”
From 'Om man så må sige – 350 Dronning Margrethe-citater', quoted in English here http://trondni.blogspot.co.uk/2012/11/new-books-wit-and-wisdom-of-margrethe-ii.html.
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Margrethe II of Denmark 29
Queen of Denmark 1940Related quotes

“One cannot prevent people from thinking what they please.”
Man kann den Menschen nicht verwehren, Zu denken, was sie wollen.
Maria Stuart, Act I, sc. viii (1800)

“The great inconvenience of new books is that they prevent us from reading the old ones.”

“Life is a nightmare that prevents one from sleeping.”

“What often prevents us from abandoning ourselves to one vice is that we have several.”
Ce qui nous empêche souvent de nous abandonner à un seul vice est que nous en avons plusieurs.
Maxim 195.
Reflections; or Sentences and Moral Maxims (1665–1678)
Source: Anti-Intellectualism in American Life (1974), p. 29

[2005, Stations of Wisdom, World Wisdom, 102, 978-0-94153218-1]
God, Reverential fear and love

Sermon 39 Catholic Spirit http://new.gbgm-umc.org/umhistory/wesley/sermons/39/ from the 1872 edition of Wesley's Complete Works - Thomas Jackson, editor
Sermons on Several Occasions (1771)

31
Sovereign Maxims
Variant: Natural justice is a pledge of reciprocal benefit, to prevent one man from harming or being harmed by another.

“The desire to appear clever often prevents one from being so.”
Le désir de paraître habile empêche souvent de le devenir.
Maxim 199.
Reflections; or Sentences and Moral Maxims (1665–1678)