tn The verse simply uses a perfect tense. The meaning of the verse would be the same if this were interpreted as an affirmation rather than as an interrogative. The first line calls such a person to one’s attention.
sn The subject matter of the verse is the person who is wise in his own opinion. Self-conceit is actually part of the folly that the book of Proverbs criticizes; those who think they are wise even though they are not are impossible to help. For someone to think he is wise when he is not makes him a conceited ignoramus (W. G. Plaut, Proverbs, 268).
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sn Previous passages in the book of Proverbs all but deny the possibility of hope for the fool. So this proverb is saying there is absolutely no hope for the self-conceited person, and there might be a slight hope for the fool—he may yet figure out that he really is a fool.