Where ignorance is bliss, 'tis folly to be wise

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