Every purpose is established by counsel: and with good advice make war.

Wesley's Notes

20:18 Established - The way to bring our purposes to good effect is to manage them with serious consideration.

Jamieson-Fausset-Brown Bible Commentary

18. (Compare Pr 15:22). Be careful and considerate in important plans.

Matthew Henry's Concise Commentary

20:7. A good man is not liable to uneasiness in contriving what he shall do, or in reflecting on what he has done, as those who walk in deceit. And his family fare better for his sake. 8. If great men are good men, they may do much good, and prevent very much evil. 9. Some can say, Through grace, we are cleaner than we have been; but it was the work of the Holy Spirit. 10. See the various deceits men use, of which the love of money is the root. The Lord will not bless what is thus gotten. 11. Parents should observe their children, that they may manage them accordingly. 12. All our powers and faculties are from God, and are to be employed for him. 13. Those that indulge themselves, may expect to want necessaries, which should have been gotten by honest labour. 14. Men use arts to get a good bargain, and to buy cheap; whereas a man ought to be ashamed of a fraud and a lie. 15. He that prefers true knowledge to riches, follows the ways of religion and happiness. If we really believed this truth, the word of God would be valued as it deserves, and the world would lose its tempting influence. 16. Those ruin themselves who entangle themselves in rash suretiship. Also those who are in league with abandoned women. Place no confidence in either. 17. Wealth gotten by fraud may be sweet, for the carnal mind takes pleasure in the success of wicked devices; but it will be bitter in the reflection. 18. Especially we need advice in spiritual warfare. The word and Spirit of God are the best counsellors in every point. 19. Those dearly buy their own praise, who put confidence in a man because he speaks fairly. 20. An undutiful child will become very miserable. Never let him expect any peace or comfort. 21. An estate suddenly raised, is often as suddenly ruined. 22. Wait on the Lord, attend his pleasure, and he will protect thee.

Matthew Henry's Whole Bible Commentary

Verse 18

Note, 1. It is good in every thing to act with deliberation, and to consult with ourselves at least, and, in matters of moment, with our friends, too, before we determine, but especially to ask counsel of God, and beg direction from him, and observe the guidance of this eye. This is the way to have both our minds and our purposes established, and to succeed well in our affairs; whereas what is done hastily and with precipitation is repented of at leisure. Take time, and you will have done the sooner. Deliberandum est diu, quod statuendum est semel-A final decision should be preceded by mature deliberation. 2. It is especially our wisdom to be cautious in making war. Consider, and take advice, whether the war should be begun or no, whether it be just, whether it be prudent, whether we be a match for the enemy, and able to carry it on when it is too late to retreat (Lu. 14:31); and, when it is begun, consider how and by what arts it may be prosecuted, for management is as necessary as courage. Going to law is a kind of going to war, and therefore must be done with good advice, Prov. 25:8. The rule among the Romans was nec sequi bellum, nec fugere-neither to urge war nor yet to shun it.