Charles H. Spurgeon on Psalms 89:20

I have found David my servant. David was discovered by the Lord among the sheepfolds and recognised as a man of gracious spirit, full of faith and courage, and therefore fit to be leader in Israel. With my holy oil have I anointed him. By the hand of Samuel, David was anointed to be king long before he ascended the throne. The verse must also be expounded of the Prince Emmanuel; he became the servant of the Lord for our sakes, the Father having found for us in his person a mighty deliverer, therefore upon him rested the Spirit without measure, to qualify him for all the offices of love to which he was set apart. We have not a Saviour self appointed and unqualified, but one sent of God and divinely endowed for his work. Our Saviour Jesus is also the Lord's Christ, or anointed. The oil with which he is anointed is God's own oil, and holy oil; he is divinely endowed with the Spirit of holiness.