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What you don't know won't hurt you

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What you don't know won't hurt you.

 and What you don't know can't hurt you.

Prov. If you do not know about a problem or a misdeed, you will not be able to make yourself unhappy by worrying about it. (Often used to justify not telling someone about a problem or misdeed.) Ellen: What a beautiful diamond necklace! Thank you! But how on earth did you get the money to pay for it? Fred: What you don't know won't hurt you.

See also: hurt, know