1 Samuel 17:32-33

Let no man's heart fail him, &c. it would have reflected upon his prince to say, Let not thy heart fail; therefore he speaks in general terms, Let no man's heart fail. A young shepherd, come but this morning from keeping sheep, has more courage than all the mighty men of Israel! Thus doth God often do great things for his people by the weak things of the world. Thou art but a youth Not above twenty years old; and a novice, a raw and an inexperienced soldier.