And as it is constantly with you, it will be stirring when objects are presented by the sense or fantasy to allure. And it is like a torrent, or a headstrong horse, that must be kept in at first, and is hardly restrained if it once break loose and get the head. If you are bred up in temperance and modesty, where there are no great temptations to gluttony, drinking, sports, or wantonness, you may think a while that your natures have little or none of this concupiscence, and so may walk without a guard: but when you come where baits of lust abound, where women, and plays, and feasts, and drunkards are the devil's snares, and tinder, and bellows, to inflame your lusts, you may then find to your sorrow, that you had need of watchfulness, and that all is not mortified that is asleep or quiet in you. As a man that goeth with a candle among gunpowder, or near thatch, should never be careless, because he goeth in continual danger; so you that are young, and have naturally eager appetites and lusts, should remember that you carry fire and gunpowder still about you, and are never out of danger while you have such an enemy to watch. And if once you suffer the fire to kindle, alas! what work may it make, ere you are aware! James i. 14, 15, "Every man is tempted when he is drawn away of his own lust, and enticed. Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death." Little knoweth the fish, when he is catching or nibbling at the bait, that he is swallowing the hook which will lay him presently on the bank. When you are looking on the cup, or gazing on alluring beauty, or wantonly dallying and pleasing your senses with things unsafe, you little know how far beyond your intentions you may be drawn, and how deep the wound may prove, how great the smart, or how long and difficult the cure. As you love your souls, observe Paul's counsel, 2 Tim. ii. 22, "Flee youthful lusts." Keep at a full distance: come not near the bait. If you get a wound in your consciences, by any wilful, heinous sin, O what a case will you be in! How heartless unto secret duty! afraid of God, that should be your joy; deprived of the comforts of his presence, and all the pleasure of his ways! How miserably will you be tormented, between the tyranny of your own concupiscence, the sting of sin, the gripes of conscience, and the terrors of the Lord! How much of the life of faith, and love, and heavenly zeal, will be quenched in a moment! I am to speak more afterwards of this; and therefore shall only say, at present, to all young converts that care for their salvation, "Mortify the flesh," and "always watch, and avoid temptations."