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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 periodicals archive ?
Thank you to everyone for the outpouring of support," Folly Farm added.
Here's what he told us about running Wales' best-loved zoo: Folly Farm Adventure Park and Zoo is home to around 1,000 animals.
Councillor Norma Wilburn, Stockton Council's Cabinet member for arts, leisure and culture, said: "This year marks 100 years since the start of the Battle of the Somme and we hope Furious Folly is a powerful reminder of the devastating loss of life that took place in the First World War and other conflicts since.
Next month the 24-yearold will show the difference Folly has made to her life.
Brian thought there had once been a pub between the Commercial inn in Folly Hall and the Royal Oak by the trac lights at the bottom of Chapel Hill.
Perrott's Folly stands at 96 feet tall and was built in the 1750s by John Perrott in Waterworks Road near to the Edgbaston Reservoir.
The third-placed hosts closed the gap to ten points and have three games in hand, while Whitnash Town are now just two points behind Folly Lane after a 7-1 demolition of mid-table Ambleside Sports.
Mr Dylan Hughes, head teacher at Ysgol Gymraeg Nant Caerau, said: "We're honoured that Folly Farm approached us to name one of their new penguins.
With many penguin enclosures in Wales and across the UK still using freshwater pools with chlorine, there are still question marks on the long-term health effects of penguins living near the chemical and Folly Farm is the first of its kind in Wales that uses a more natural saltwater pool.
The new variety, Westerton Folly, passed the test and has taken its place in this year's Halls catalogue.
Crapper, who among others trained Frisby Folly to St Leger glory for Brookes, said: "My wife Berice and I were very sad to hear the news of the death of Roy Brookes.
That is why we work with organizations like the Fort Folly First Nation to ensure Aboriginal people are able to take full advantage of economic opportunities.
YOANN FOLLY last night thanked Aberdeen physio John Sharp for helping to save his life.