I am looking for a phrase which completes the sentence with following meaning.
Ignorance is bliss but its consequence is disastrous.
I came up with its consequence is disastrous.
Is there any known phrase or proverb close to this meaning?
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From Thomas Gray's poem, Ode on a Distant Prospect of Eton College (1742)
the actual full phrase...
"—where ignorance is bliss, 'Tis folly to be wise." (Thomas Grey Archive)
Many compare this with the phrase: "What you don't know can't hurt you"
I prefer Ricky Gervais' take:
"Ignorance is bliss. But only for the ignorant."