1st Samuel 17:32 And David said to Saul, Let no man's heart fail because of him; thy servant will go and fight with this Philistine.
David was cute at that age, and after he learned from his brothers of the existential threat posed to the nation because of Goliath, David made King Saul an offer that would make any battle-hardened general recoil with unbelief. David confidently stated that he would be willing to fight the giant singlehandedly and that he was certain that he would win.
Again, we ask the question: “What makes David so confident, and that against all odds?” He has to be making that offer based upon something he knows for sure, and if so, then it is not presumption as king Saul suggested, but faith in real time.
We could almost guarantee, that if it was someone like Mike Tyson who made the offer King Saul would not think twice; but for this cute youth, who had no battle scars or tattoos on his face, to offer to fight the giant seemed to be an absolute, and a foolish mismatch.
1st Samuel 17:33 And Saul said to David, Thou art not able to go against this Philistine to fight with him: for thou art but a youth, and he a man of war from his youth.
May The Lord add His blessing to the study of His word. God bless!