John Calvin's Commentary on the Bible

20 (Psalms 89:20)

Verse 20

20I have found David my servant. The prophet confirms the same proposition, That there was nothing of royalty in David, who owed all to the sovereignty of God in preventing him by his grace. Such is the import of the wordfound, as if God had said, When I took him to elevate him, this proceeded entirely from my free goodness. The name servant, therefore, does not denote any merit, but is to be referred to the divine call. It is as if God had said, that he confirmed and ratified by his authority the sovereign power of David; and if He approved it, its legitimacy is placed beyond all doubt. The second clause of the verse affords an additional confirmation of God’s free election: With my holy oil have I anointed him. This anointing, which was not the fruit of David’s own policy, but which he obtained contrary to all expectation, was the cause of his elevation to the estate of royalty. God then having of himself, and according to his mere good pleasure, anticipated David, that he might anoint him king by the hand of Samuel, he justly declares that he found him. It is afterwards added, that he will be the guardian and protector of this kingdom of which he was the founder; for it is not his usual way to abandon his works after having commenced them, but, on the contrary, to carry them forward by a continued process of improvement to their completion.

- John Calvin's Commentary on the Bible