Proverbs 18:2

But that his heart may discover itself - It is a fact that most vain and foolish people are never satisfied in company, but in showing their own nonsense and emptiness. But this verse may be understood as confirming the view already given of the preceding, and may be translated thus: "But a fool doth not delight in understanding, though it should even manifest itself:" so I understand כי אם בהתגלות ki im behithgalloth. The separated person seeks understanding in every hidden thing, and feels his toil well repaid when he finds it, even after the most painful and expensive search: the other regards it not, though its secret springs should be laid open to him without toil or expense.

Another form of egotism. In "understanding," i. e., self-knowledge, the "fool" finds no pleasure; but self-assertion, talking about himself and his own opinions, is his highest joy.

18:2 Understanding - In getting sound and saving, knowledge. The discovery - In uttering that folly and wickedness which is in his heart.