Adams on Psalm 12:2 & 13:5

12:2 They speak with a double heart. The original is, "A heart and a heart:" one for the church, another for the change; one for Sundays, another for working-days; one for the king, another for the pope. A man without a heart is a wonder, but a man with two hearts is a monster. It is said of Judas, "There were many hearts in one man;" and we read of the saints, "There was one heart in many men." Acts 4:32. Dabo illis cor unum; a special blessing.

13:5 I have trusted in thy mercy; my heart shall rejoice in thy salvation. Though passion possess our bodies, let "patience possess our souls." The law of our profession binds us to a warfare; patiendo vincimus, our troubles shall end, our victory is eternal. Here David's triumph (Psalm 18:38-40), "I have wounded them, that they were not able to rise; they are fallen under my feet. Thou hast subdued under me those that rose up against me. Thou hast also given me the neck of mine enemies," etc. They have wounds for their wounds; and the treaders down of the poor are trodden down by the poor. The Lord will subdue those to us that would have subdued us to themselves; and though for a short time they rode over our heads, yet now at last we shall everlastingly tread upon their necks. Lo, then, the reward of humble patience and confident hope. Speramus et superamus. Deuteronomy 32:31. "Our God is not as their God, even our enemies being judges." Psalm 20:7 "Some put their trust in chariots, and some in horses." But no chariot hath strength to oppose, nor horse swiftness to escape, when God pursues. Verse 8 "They are brought down and fallen; we are risen and stand upright." Their trust hath deceived them; down they fall, and never to rise. Our God hath helped us; we are risen, not for a breathing space, but to stand upright for ever.

As quoted in Spurgeon's Treasury of David.