Battle is the soldier's vital breath! Peace turns him into a stooping asthmatic. War makes him a whole man again, and gives him the heart, strength, and vigor of a hero.
David - the man after God's own heart - was a man of war and a mighty man of valour. When all Israel were on the run, David faced Goliath - alone... with God - and he but a stripling, and well scolded, too, by his brother for having come to see the battle.