يُعْمِي وَيُصِمُّ
It prevents a person from seeing faults and hearing criticism.
The expression draws on two senses, sight and hearing, to depict a moral danger: preference can veil facts. It does not denigrate people with disabilities or claim that every instance of love necessarily causes poor judgment.
يُعْمِي is derived from ع م ي, and يُصِمُّ from ص م م. Both are imperfect verb forms. The first image concerns sight, the second hearing; together they form a vivid warning.
Example: someone admires a teacher's sound guidance but can still acknowledge a demonstrated mistake. Appreciation has not eliminated fairness.