Each and every motion arising from the corruptions of the heart, or from habitual lust, whether it has a particular object, or be but a vagrant imagination, though not delighted in, or consented to, is sin before God. This will easily appear if we consider, first, that they arise from a sinful principle, they are born of the flesh, and are of the nature of original sin; and if the tree be corrupt, so must every bit of the fruit. Two, they are unconformed to the law of God, and so must be sinful in their nature, as well as in their rising, “they lust against and oppose the Spirit” (Galatians 5:17), and so must oppose the law of God; if they be against the law in the heart, they are also against the written law. Now it is upon these accounts that the faintest motions and stirrings of sin, are grievous to the godly. The tender lively Christian, as he groans under a body of sin, he is pained by it. The most sudden vagrant motions of mind, and heart, and affections, are burdensome to him, because they betray a living principle of sin in his soul. Be convinced of the sinfulness of this!