Here we have, 1. The virtues of a good king. Those are mercy and truth, especially mercy, for that is mentioned twice here. He must be strictly faithful to his word, must be sincere, and abhor all dissimulation, must religiously discharge all the trusts reposed in him, must support and countenance truth. He must likewise rule with clemency, and by all acts of compassion gain the affections of his people. Mercy and truth are the glories of God's throne, and kings are called gods. 2. The advantages he gains thereby. These virtues will preserve his person and support his government, will make him easy and safe, beloved by his own people and feared by his enemies, if it be possible that he should have any.

Mercy and truth preserve the king,.... Which are two good qualifications in a prince; not ruling his subjects with rigour and cruelty, but with tenderness and clemency; easing them as much as he can of burdens and pressures; showing compassion to the distressed, and pardoning delinquents when the case will admit of it; as also being faithful to his word, promises, and engagements; inviolably adhering to the laws and constitution of the nation, and steady in his administrations of justice; these preserve him in the affections of his people, and make him safe and secure on his throne; and because of these the Lord preserves him from his enemies. It maybe rendered, "grace and truth" (l); and applied to Christ, who is full of both, and which are said to preserve him, Psa 40:11;

and his throne is upholden by mercy; this explains what is meant by the preservation of him, and what is the security of his throne and kingdom, which is clemency and goodness to his subjects.

(l) "gratis et veritas", Cocceius.

(Compare Pro 3:3; Pro 16:6, Pro 16:12).