We are no sooner warmed with the celestial flames, but natural corruption is inclining us to grow cold; like hot water, which loseth its heat by degrees, unless the fire be continually kept under it. Who feeleth not that as soon as in a sermon, or prayer, or holy meditation, his heart hath got a little heat, as soon as it is gone, it is prone to its former earthly temper, and by a little remissness in our duty, or thoughts, or business about the world, we presently grow cold and dull again. Be watchful, therefore, lest it decline too far. Be frequent in the means that must preserve you from declining: when faintness telleth you that your stomach is emptied of the former meat, supply it with another, lest strength abate. You are rowing against the stream of fleshly interest and inclinations; and therefore intermit not too long, lest you go faster down by your ease, than you get up by labour. [Sidenote: How grace may degenerate.] The degenerating of grace, is a way of backsliding, very common, and too little observed. It is, when good affections do not directly cool, but turn into some carnal affections somewhat like them, but of another kind: as, if the body of a man, instead of dying, should receive the life or soul of a beast, instead of the reasonable, human soul. For instance: 1. Have you believed in God, and in Jesus Christ, and loved him accordingly? You shall seem to do so still as much as formerly, when your corrupted minds have received some false representation of him; and so it is indeed another thing that you thus corruptly believe and love. 2. Have you been fervent in prayer? You shall be fervent still; if Satan can but corrupt your prayers, by corrupting your judgment or affections, and get you to think that to be the cause of God, which is against him; and that to be against him, which he commandeth; and those to be the troublers of the church, which are its best and faithfullest members: turn but your prayers against the cause and people of God by your mistake, and you may pray as fervently against them as you will. The same I may say of preaching, and conference, and zeal: corrupt them once, and turn them against God, and Satan will join with you for zealous and frequent preaching, or conference, or disputes. 3. Have you a confidence in Christ and his promise for your salvation? Take heed lest it turn into carnal security, and a persuasion of your good estate upon ill grounds, or you know not why. 4. Have you the hope of glory? Take heed lest it turn into a careless venturousness of your soul, or the mere laying aside of fear and cautelous suspicion of yourselves. 5. Have you a love to them that fear the Lord? Watch your hearts, lest it degenerate into a carnal or a partial love. Many unheedful young persons of different sexes, at first love each other with an honest, chaste, and pious love; but imprudently using too much familiarity, before they were well aware it hath turned into a fleshly love, which