Then there is the other characteristic of suddenness. The dart comes without any warning. The arrow is invisible until it is buried in the man's breast. The pestilence walks in darkness, and the victim does not know until its poison fang is in him. Ah! yes! brethren, the most dangerous of our temptations are those that are sprung upon us unawares. We are going quietly along the course of our daily lives, occupied with quite other thoughts, and all at once, as if a door had opened, not out of heaven but out of hell, we are confronted with some evil thing that, unless we are instantaneously on our guard, will conquer us almost before we know. Evil tempts us because it comes to us, for the most part, without any beat of drum or blast of trumpet to say that it is coming, and to put us upon our guard. The batteries that do most harm to the advancing force are masked until the word of command is given, and then there is a flash from every cannon's throat and a withering hail of shot that confounds by its unexpectedness as well as kills by its blow. The fiery darts that light up the infernal furnace in a man's heart, and that smite him all unawares and unsuspecting, these are the weapons that we have to fear most. II. Consider next, the defence: 'the shield of faith.' Now, the Old Testament says things like this: 'Fear not, Abraham; I am thy Shield.' The psalmist invoked God, in a rapturous exuberance of adoring invocations, as his fortress, and his buckler, and the horn of his salvation, and his high tower. The same psalm says, 'The Lord is a shield to all them that put their trust in Him'; and the Book of Proverbs, which is not given to quoting psalms, quotes that verse. Another psalm says, 'The Lord God is a sun and shield.' And then Paul comes speaking of 'the shield of _faith_.' What has become of the other one? The answer is plain enough. My faith is nothing except for what it puts in front of me, and it is God who is truly my shield; my faith is only called a shield, because it brings me behind the bosses of the Almighty's buckler, against which no man can run a tilt, or into which no man can strike his lance, nor any devil either. God is a defence; and my trust, which is nothing in itself, is everything because of that with which it brings me into connection. Faith is the condition, and the only condition, of God's power flowing into me, and working in me. And when that power flows into me, and works in me, then I can laugh at the fiery darts, because 'greater is He that is with us than all they that are with them.'