He also that is slothful in his work is brother to him that is a great waster.

Wesley's Notes

18:9 Is brother - Though they take several paths, yet both come to one end.

Jamieson-Fausset-Brown Bible Commentary

9. One by failing to get, the other by wasting wealth, grows poor.

waster-literally, "master of washing," a prodigal.

Matthew Henry's Concise Commentary

18:4. The well-spring of wisdom in the heart of a believer, continually supplies words of wisdom. 5. The merits of a cause must be looked to, not the person. 6,7. What mischief bad men do to themselves by their ungoverned tongues! 8. How base are those that sow contention! and what fatal effects may be expected from small beginnings of jealousy! 9. Omissions of duty, and in duty, are fatal to the soul, as well as commissions of sin. 10,11. The Divine power, made known in and through our Lord Jesus Christ, forms a strong tower for the believer, who relies on the Lord. How deceitful the defence of the rich man, who has his portion and treasure in this world! It is a strong city and a high wall only in his own conceit; for it will fail when most in need. They will be exposed to the just wrath of that Judge whom they despised as a Saviour. 12. After the heart has been lifted up with pride, a fall comes. But honour shall be the reward of humility. 13. Eagerness, with self-conceit, will expose to shame. 14. Firmness of mind supports under many pains and trials. But when the conscience is tortured with remorse, no human fortitude can bear the misery; what then will hell be? 15. We must get knowledge, not only into our heads, but into our hearts. 16. Blessed be the Lord, who makes us welcome to come to his throne, without money and without price. May his gifts make room for him in our souls.

Matthew Henry's Whole Bible Commentary

Verse 9

Note, 1. Prodigality is very bad husbandry. Those are not only justly branded as fools among men, but will give an uncomfortable account to God of the talents they are entrusted with, who are wasters of their estates, who live above what they have, spend and give more than they can afford, and so, in effect, throw away what they have, and suffer it to run to waste. 2. Idleness is no better. He that is remiss in his work, whose hands hang down (so the word signifies), that stands, as we may, with his thumbs in his mouth, that neglects his business, does it not at all, or as if he did it not, he is own brother to him that is a prodigal, that is, he is as much a fool and in as sure and ready a way to poverty; one scatters what he has, the other lets it run through his fingers. The observation is too true in the affairs of religion; he that is trifling and careless in praying and hearing is brother to him that does not pray or hear at all; and omissions of duty and in duty are as fatal to the soul as commissions of sin.