It is reported on the authority of Al-Walīd b. Mazyad that he said:

I heard Al-Awzā’ī say, when I asked him, “Who is a fool?” He replied, “One who is blind to what is wrong (evil), [though] he has insight into what is good.”

Al-Dhahabī, Siyar A’lām Al-Nubalā` 7:116.