Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.

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
References in classic literature ?
Nay, then, Valour and Folly are once more boon companions,'' said the Jester, coming up frankly to the Knight's side; ``but, in truth, I love not such buffets as that you bestowed on the burly Friar, when his holiness rolled on the green like a king of the nine-pins.
said Wamba; ``when do you ever find Folly separated from Valour?
She saw it only as folly, and that folly stamped only by exposure.
Then, for heaven's sake, forget all this folly," Wingrave said hardly.
Now I saw, though too late, the Folly of beginning a Work before we count the Cost, and before we judge rightly of our own Strength to go through with it.
There I have sat helpless (in spite of my abilities) ever since; seeing what Robinson Crusoe saw, as quoted above--namely, the folly of beginning a work before we count the cost, and before we judge rightly of our own strength to go through with it.
IT'S not quite the job title you associate with a zoo but Pembrokeshire's Folly Farm Adventure Park and Zoo has appointed a new librarian.
ABut adorable poodlecross Folly is much, much more than that to owner Katy Evans.
A saga of intrigue, love, and adventure, The Highlander's Folly is rapturously performed by Audie Award winner Phil Gigante.
BILLY Kendall and his chum Brian asked for help identifying a phantom pub at Folly Hall.
MORE than 100 people attended an architecture day to discuss the future of the famous Perrott's Folly tower in Edgbaston.
THE Bell (AEI) Rugby kept the title race wide open in the AW Engraving Premier Division with a 5-2 win over leaders Folly Lane.
com Offers Birds Eye View of Folly, Optimized Booking for South Carolina Tourism.
PUPILS from Ysgol Gymraeg Nant Caerau in Ely, Cardiff, were approached by Pembrokeshire tourist attraction Folly Farm to name one of its 24 new Humboldt penguins.
com)-- Wildlife fans from across Wales descended upon Folly Farm as the adventure park and zoo opened its [pounds sterling]500,000 penguin enclosure.