From Wiktionary, the free dictionary
Literally, “the eye of fondness is weak-sighted for any blemish.”
عَيْنُ الرِضَا عَن كُلِّ عَيْبٍ كَلِيلةٌ • (ʕaynu r-riḍā ʕan kulli ʕaybin kalīlatun)
- People tend not to notice, or to ignore, the faults of those whom they like and favour.