And now we begin to understand why this supremely horrible transaction should be given in the Bible, and given at such length. It bears the character of a beacon, warning the mariner against some of the most deceitful and perilous rocks that are to be found in all the sea of life. First of all, it shows the danger of interrupting, however briefly, the duty of watching and praying, lest you enter into temptation. It is at your peril to discontinue earnest daily communion with God, especially when the evils are removed that first drove you to seek His aid. An hour's sleep may leave Samson at the mercy of Delilah, and when he awakes his strength is gone. Further, it affords a sad proof of the danger of dallying with sin even in thought. Admit sin within the precincts of the imagination, and there is the utmost danger of its ultimately mastering the soul. The outposts of the spiritual garrison should be so placed as to protect even the thoughts, and the moment the enemy is discovered there the alarm should be given and the fight begun. It is a serious moment when the young man admits a polluted thought to his heart, and pursues it even in reverie. The door is opened to a dangerous brood. And everything that excites sensual feeling, be it songs, jests, pictures, books of a lascivious character, all tends to enslave and pollute the soul, till at length it is saturated with impurity, and cannot escape the wretched thraldom. And further, this narrative shows us what moral havoc and ruin may be wrought by the toleration and gratification of a single sinful desire. You may contend vigorously against ninety-and-nine forms of sin, but if you yield to the hundredth the consequences will be deadly. You may fling away a whole box of matches, but if you retain one it is quite sufficient to set fire to your house. A single soldier finding his way into a garrison may open the gates to the whole besieging army. One sin leads on to another and another, especially if the first be a sin which it is desirable to conceal. Falsehood and cunning, and even treachery, are employed to promote concealment; unprincipled accomplices are called in; the failure of one contrivance leads to other contrivances more sinful and more desperate. If there is a being on earth more to be pitied than another it is the man who has got into this labyrinth. What a contrast his perplexed feverish agitation to the calm peace of the straightforward Christian! "He that walketh uprightly walketh surely; but he that perverteth his way shall be known." Never let any one read this chapter of 2 Samuel without paying the profoundest regard to its closing words--"But the thing that David had done displeased the Lord." In that "but" lies a whole world of meaning. CHAPTER XV. _DAVID AND NATHAN._ 2 SAMUEL xii. 1-12; 26-31.