[17:21] 1 sn Here the Hebrew terms כְּסִיל (kÿsil) and נָבָל (naval) are paired. The first one, which occurs about fifty times in the book, refers to a dullard, whether it be in spiritual, intellectual, or moral matters. The second word, rare in the book, primarily focuses on religious folly – it refers to the practical atheist, the one who lives as if there is no God.
[17:21] 2 tn The form simply means “bears” or “gives birth to,” but since it is masculine it could be rendered “fathers” (cf. NASB “he who begets a fool”; NIV “To have a fool for a son”). The form for “fool” is masculine, but the proverb is not limited only to male children (cf. NCV “It is sad to have a foolish child”).
[17:21] 3 tn The phrase “does so” is supplied for the sake of clarification.
[17:21] 4 sn Parents of fools, who had hoped for children who would be a credit to the family, find only bitter disappointment (cf. TEV “nothing but sadness and sorrow”).
(NT only) to listen to the NET Bible 
