With good advice make war, - Perhaps there is not a precept in this whole book so little regarded as this. Most of the wars that are undertaken are wars of injustice, ambition, aggrandizement, and caprice, which can have had no previous good counsel. A minister, who is perhaps neither a good nor a great man, counsels his king to make war; the cabinet must be brought into it, and a sufficient number out of the states of the kingdom gained over to support it. By and by, what was begun through caprice must be maintained through necessity. Places must be created, and offices must be filled with needy dependents, whose interest it may be to protract the war, till they get enough to pay their debts, and secure independence for life. And for these most important ends the blood of the country is spilled, and the treasures of the people exhausted! I have met with a fact precisely of this kind under the reign of Louis XIV.

Every purpose is established by counsel,.... Or "the thought" (f) of a man, everyone of them, what he has thought to do, formed a scheme of in his mind, and resolved upon, by taking advice of his friends, and especially by asking counsel of God, who gives, wisdom liberally, and upbraids not; he is confirmed in his good designs; and he cheerfully pursues them, and they are ordered and directed to the glory of God, his own good and the good of others; for this can only be understood of wise and good thoughts and purposes;
and with good advice make war; this should not be entered upon rashly, without first considering whether there is a just and lawful cause of it; and without consulting the necessary charge and expense of it; whether there is a sufficiency of men and money to carry it on; and what may probably be the issue of it. It is right in a king to advise with his privy council, or with the chief council of the nation; but, above all, both he and his people should seek advice of the Lord on such an occasion; see Luke 14:31. This may be applied to our spiritual warfare with sin, Satan, and the world; not that it should be any doubt with whether we should engage in such a war; but we should advise with experienced soldiers, and especially with God and his word, what weapons to take, and how to use them; and consider in whose name and strength we are to fight; and inquire and learn the force, methods, and designs of the enemy, and where to guard against them or attack them. Jarchi interprets it of making war with Satan by repentance, prayer, and fasting.
(f) "cogitationes", V. L. Pagninus, Montanus, Cocceius, Gejerus; "unaquaeque cogitationum", Piscator, Mercerus, Michaelis.

Especially we need advice in spiritual warfare. The word and Spirit of God are the best counsellors in every point.

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

18 Plans are established by counsel,
And with prudent government make war.
From the conception of a thought, practically influencing the formation of our own life and the life of the community, to its accomplishment there is always a long way which does not lead to the end unless one goes forward with counsel and strength combined, and considers all means and eventualities. The Niph. of כּוּן means, in a passive sense: to be accomplished or realized (Psalm 141:2). The clause 18a is true for times of war as well as for times of peace; war is disastrous, unless it is directed with strategic skill (vid., regarding תּחבּות, Proverbs 1:5). Grotius compares the proverb, Γνῶμαι πλέον δρατοῦσιν ἢ σθένος χειρῶν. In Proverbs 24:6, the necessity of counsel is also referred to the case of war. Ewald would read [the infin.] עשׂה, or עשׂה: with management it is that one carries on war. But why? Because to him the challenge to carry on war appears to be contrary to the spirit of proverbial poetry. But the author of the proverb does certainly mean: if thou hast to carry on war, carry it on with the skill of a general; and the imper. is protected by Proverbs 24:6 against that infin., which is, besides, stylistically incongruous.

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