16:13 Anointed him - David's brethren saw David's unction, yet did not understand, that he was anointed to the kingdom; but were only told by Samuel, that he was anointed to some great service, which hereafter they should know. Thus Jesse only, and David, understood the whole business, and his brethren were able to attest to that act of Samuel's anointing him, which, with other collateral evidences, was abundantly sufficient to prove David's right to the kingdom, if need should be. The spirit, and c, - That is, he was immediately endowed with extraordinary gifts of God's Spirit, as strength, and courage, and wisdom, and other excellent qualities which fitted him for, and put him upon noble attempts.
16:6-13 It was strange that Samuel, who had been so disappointed in Saul, whose countenance and stature recommended him, should judge of another man by that rule. We can tell how men look, but God can tell what they are. He judges of men by the heart. We often form a mistaken judgment of characters; but the Lord values only the faith, fear, and love, which are planted in the heart, beyond human discernment. And God does not favour our children according to our fond partiality, but often most honours and blesses those who have been least regarded. David at length was pitched upon. He was the youngest of the sons of Jesse; his name signifies Beloved; he was a type of God's beloved Son. It should seem, David was least set by of all the sons of Jesse. But the Spirit of the Lord came upon David from that day forward. His anointing was not an empty ceremony, a Divine power went with that instituted sign; he found himself advanced in wisdom and courage, with all the qualifications of a prince, though not advanced in his outward circumstances. This would satisfy him that his election was of God. The best evidence of our being predestinated to the kingdom of glory, is, our being sealed with the Spirit of promise, and experience of a work of grace in our hearts.
