what the eye doesn't see, the heart doesn't grieve over

what the eye doesn't see, the heart doesn't grieve over

Remaining ignorant or uninformed about something means it will not upset, anger, or worry someone. A: "Have you told the boss about this plan?" B: "It's better that he stay in the dark about this. What the eye doesn't see, the heart doesn't grieve." I just hung a picture over the hole in the wall in case the landlord ever comes by—what the heart doesn't see, the heart doesn't grieve.
See also: eye, grieve, heart, over, what
Farlex Dictionary of Idioms.

What the eye doesn't see, the heart doesn't grieve over.

Prov. You cannot be upset by something you do not know about. When Robbie cracked his mother's favorite vase, he simply turned the cracked side toward the wall. "What the eye doesn't see, the heart doesn't grieve over," he thought.
See also: eye, grieve, heart, over, what
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

what the eye doesn't see

People say what the eye doesn't see to mean that if someone does not know about something, it cannot upset them. `Can I take a break?' — `Sure. The boss is miles away, and what the eye doesn't see.' Note: People sometimes use the full expression what the eye doesn't see, the heart doesn't grieve over. He knew his father would disapprove, but what the eye doesn't see, the heart doesn't grieve over.
See also: eye, see, what
Collins COBUILD Idioms Dictionary, 3rd ed.

what the eye doesn't see, the heart doesn't grieve over

if you're unaware of an unpleasant fact or situation you can't be troubled by it. proverb
See also: eye, grieve, heart, over, what
Farlex Partner Idioms Dictionary

what the eye doesn’t ˈsee (the heart doesn’t ˈgrieve over)

(saying) if a person does not know about something that they would normally disapprove of, then it cannot hurt them: What does it matter if I do use his desk while he’s away? What the eye doesn’t see...!
See also: eye, see, what
Farlex Partner Idioms Dictionary
See also:
  • what the eye doesn't see
  • What you don't know won't hurt you
  • what (someone) doesn't know can't hurt them
  • what (someone) doesn't know won't hurt them
  • what one doesn't know won't hurt one
  • stay in the dark
  • stay in the dark about (something)
  • keep (someone) in the dark (about something)
  • keep in the dark
  • keep someone in the dark