folly

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Related to follies: Ziegfeld Follies

as a dog returns to his vomit, so a fool repeats his folly

Foolish people are apt to repeat their missteps. A: "I can't believe Sarah is going skiing again, after she broke her leg the last time." B: "Well, as a dog returns to his vomit, so a fool repeats his folly."
See also: dog, folly, fool, repeat, return

Where ignorance is bliss, 'tis folly to be wise.

Prov. If knowing something makes you unhappy, it would be better not to know it. (Also the cliché: ignorance is bliss.) Ellen: The doctor didn't tell Dad that Mom probably won't recover from her illness. Do you think we should tell him? Bill: No. It would only make him unhappy and ruin their last months together. Where ignorance is bliss, 'tis folly to be wise.
See also: folly, ignorance, wise