John Trapp on Psalms 52:8

Verſ. 8. But I am like a green Olive-tree, &c.] Thus, when Doeg blaſted David, David bleſſeth himſelf. Let him flouriſh in the Court, I ſhall much more in the Houſe of God. My name ſhall be precious among the Saints, when he ſtinketh above ground; hee ſhall wither, when I ſhall bee freſh, flouriſhing, and fruitfull.

I truſt in the mercy of God] Not in riches, as Doeg: and this faith is the root of my fruitfulneſs, cheerfulneſs, &c. Gul. Pariſienſis reporteth of true Chryſtal, that by touching only it reviveth the decayed vertue of other precious ſtones: ſure it is, that faith reviveth the vertue of other precious graces.