David said to Saul, Let no man's heart fail because of him; your servant will go and fight with this Philistine.
      I. To get clear of the objection Saul made against his undertaking. "Alas!" says Saul, "thou hast a good heart to it, but art by no means an equal match for this Philistine. To engage with him is to throw away a life which may better be reserved for more agreeable services. Thou art but a youth, rash and inconsiderate, weak and unversed in arms: he is a man that has the head and hands of a man, a man of war, trained up and inured to it from his youth (1 Samuel 17:33; 1 Samuel 17:33), and how canst thou expect but that he will be too hard for thee?" David, as he had answered his brother's passion with meekness, so he answered Saul's fear with faith, and gives a reason of the hope which was in him that he should conquer the Philistine, to the satisfaction of Saul. We have reason to fear that Saul had no great acquaintance with nor regard to the word of God, and therefore David, in reasoning with him, fetched not his arguments and encouragements thence, how much soever he had an eye to it in his own mind. But he argues from experience; though he was but a youth, and never in the wars, yet perhaps he had done as much as the killing of Goliath came to, for he had had, by divine assistance, spirit enough to encounter and strength enough to subdue a lion once and another time a bear that robbed him of his lambs, 1 Samuel 17:34-36; 1 Samuel 17:34-36. To these he compares this uncircumcised Philistine, looks upon him to be as much a ravenous beast as either of them, and therefore doubts not but to deal as easily with him; and hereby he gives Saul to understand that he was not so inexperienced in hazardous combats as he took him to be.