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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."
where ignorance is bliss, 'tis folly to be wise
proverb It is better to remain unaware or ignorant of things that may otherwise cause one stress; if you don't know about something, you don't need to worry about it. From the 1742 poem "Ode on a Distant Prospect of Eton College," by Thomas Gray. I feel like all the news in the world today is depressing, and the only way to get on with your life is to completely ignore it all. As they say, where ignorance is bliss, 'tis folly to be wise. Look, I know you get stressed about what the kids eat when they stay at your mother's house, but they're happy and have plenty of energy. When ignorance is bliss, it's folly to be wise.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.