Prudence

prudence
ˈpruːd(ə)ns/
noun
the quality of being prudent; cautiousness.
synonyms:
wisdom, judgement, judiciousness, sagacity, shrewdness, advisability, cautiousness, carefulness, canniness, chariness, wariness, circumspection; foresight, forethought; discretion
                                                                                                               (Google)

"It is by the goodness of God that in our country we have those three unspeakably precious things: freedom of speech, freedom of conscience, and the prudence never to practice either of them. " 
- Mark Twain