1 Samuel 17:34-37

Thy servant kept his father's sheep— The young hero builds his confidence upon four arguments: 1. Upon the courage and success with which he heretofore combated a lion at one time, and a bear at another; enemies full as terrible as Goliath. 2. Upon Goliath's being uncircumcised, an enemy of the people and covenant of God. 3. Upon the full assurance that God will support any one who shall undertake to punish this monster for his insolent treatment of the Israelites as slaves. 4. Upon the experience he had already had of the succour and protection of Providence; an experience which firmly persuades him, that the same God who delivered him from the fury of lions and bears, will not fail to give him victory over Goliath, however formidable and invincible he may appear. One knows not which to admire most in these reflections, and the manner of expressing them; whether the courage of David, or his piety and modesty.