17:31-39 A shepherd lad, come the same morning from keeping sheep, had more courage than all the mighty men of Israel. Thus God often sends good words to his Israel, and does great things for them, by the weak and foolish things of the world. As he had answered his brother's passion with meekness, so David answered Saul's fear with faith. When David kept sheep, he proved himself very careful and tender of his flock. This reminds us of Christ, the good Shepherd, who not only ventured, but laid down his life for the sheep. Our experience ought to encourage us to trust in God, and be bold in the way of duty. He that has delivered, does and will continue to do so. David gained leave to fight the Philistine. Not being used to such armour as Saul put upon him, he was not satisfied to go in that manner; this was from the Lord, that it might more plainly appear he fought and conquered in faith, and that the victory was from Him who works by the feeblest and most despised means and instruments. It is not to be inquired how excellent any thing is, but how proper. Let Saul's coat be ever so rich, and his armour ever so strong, what is David the better if they fit him not? But faith, prayer, truth, and righteousness; the whole armour of God, and the mind that was in Christ; are equally needful for all the servants of the Lord, whatever may be their work.

37. The Lord that delivered me—It would have been natural for a youth, and especially an Oriental youth, to make a parade of his gallantry. But David's piety sank all consideration of his own prowess and ascribed the success of those achievements to the divine aid, which he felt assured would not be withheld from him in a cause which so intimately concerned the safety and honor of His people.

Saul said unto David, Go, and the Lord be with thee—The pious language of the modest but valiant youth impressed the monarch's heart. He felt that it indicated the true military confidence for Israel, and, therefore, made up his mind, without any demur, to sanction a combat on which the fate of his kingdom depended, and with a champion supporting his interests apparently so unequal to the task.