what (someone) doesn't know can't hurt them

what (someone) doesn't know can't hurt them

Remaining ignorant or uninformed about something will allow someone to not have to worry about, feel responsible for, or get upset by it. A: "Where are you going?" B: "It's better that you stay in the dark about this. What you don't know can't hurt you." A: "Mom will freak out if she finds out that you took the car without asking!" B: "Of course she will. But what Mom doesn't know can't hurt her."
See also: hurt, know, what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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