what you don't know won't hurt you

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what you don't know won't hurt you

Remaining ignorant or uninformed about something will allow you to not have the sense of responsibility to worry or think about it. A: "Where are you going?" B: "It's better that you stay in the dark about this. What you don't know won't hurt you."
See also: hurt, know, what

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, what