Matthew Henry Commentary Proverbs 10:15-17

"The rich man`s wealth is his strong city: The destruction of the poor is their poverty. The labor of the righteous [tendeth] to life; The increase of the wicked, to sin. He is in the way of life that heedeth correction; But he that forsaketh reproof erreth." — Proverbs 10:15-17 (ASV)

Cruelty and covetousness are two daughters of the horseleech, that still cry, Give, give, and they are continually uneasy within themselves. Four things never are satisfied, to which these devourers are compared. Those who are always coveting are never rich. And many who have come to a bad end have admitted that their wicked ways began by despising their parents' authority.