Faith is in some respects the first of all the Christian graces. It is the beginning of spiritual life in the soul—the originating and sustaining principle of all evangelical holiness. Having faith, we have nothing to do but to add to it all the rest of our lives. “Add to your faith virtue, and to virtue knowledge, and to knowledge temperance, and to temperance patience, and to patience godliness, and to godliness brotherly kindness, and to brotherly kindness charity.” Love is in some respects superior to faith, and shall live and rejoice before the throne when faith shall have finished its work; but faith is an impenetrable shield, such as love cannot furnish, on the field of battle. The shield was a broad piece of defensive armor, worn ordinarily on the left arm; and which, being movable, might be used to defend any part of the body. According to Homer, the shields of some of the warriors at the siege of Troy were made of sevenfold thick bull-hides, covered with brass. The value of “the shield of faith” is seen in the case of David. Look down there in the valley. There is Goliath of Gath, the chief of the giants, blaspheming, and defying the armies of the living God. His spear is as a weaver’s beam, and his armor-bearer carries before him an enormous shield. And there is a fine-looking young man going down to meet him, without any visible weapons, except his shepherd’s sling, and five smooth stones from the brook. David! hast thou no fear? Rash youth! is thy unpractised hand able to cope with the mailed champion of Philistia? “I will go and meet him in the name of my God, for I know that the Lord will deliver him into my hand. God will avenge his people, and vindicate his own honor against the insults of his enemies. He who defended me against the lion and the bear will save me from the hand of the blasphemer, and glorify himself this day before the thousands of Israel.” He moves on, invincibly shielded by his faith, and the next moment Goliath is slain with his own sword.