The mortification of sin in particular described — The several parts and degrees thereof — The habitual weakening of its root and principle — The power of lust to tempt — Differences of that power as to persons and times — Constant fighting against sin — The parts thereof considered — Success against it — The sum of this discourse considered.
What it is to mortify a sin in general, which will make farther way for particular directions, is nextly to be considered.
2. The mortification of a lust consists in three things:—
(1.) An habitual weakening of it. Every lust is a depraved habit or disposition, continually inclining the heart to evil. Thence is that description of him who hath no lust truly mortified, Gen. vi. 5, “Every imagination of the thoughts of his heart is only evil continually.” He is always under the power of a strong bent and inclination to sin. And the reason why a natural man is not always perpetually in the pursuit of some one lust, night and day, is because he hath many to serve, every one crying to be satisfied; thence he is carried on with great variety, but still in general he lies towards the satisfaction of self.
We will suppose, then, the lust or distemper whose mortification is inquired after to be in itself a strong, deeply-rooted, habitual inclination and bent of will and affections unto some actual sin, as to the matter of it, though not, under that formal consideration, always stirring up imaginations, thoughts, and contrivances about the object of it. Hence, men are said to have their “hearts set upon evil,” the bent of their spirits lies towards it, to make “provision for the flesh.”1 And a sinful, depraved habit, as in many other things, so in this, differs from all natural or moral habits whatever: for whereas they incline the soul gently and suitably to itself, sinful habits impel with violence and impetuousness; whence lusts are said to fight or wage “war against the soul,”2 1 Pet. ii. 11, — to rebel or rise up in war with that conduct and opposition which is usual therein,3 Rom. vii. 23, — to lead captive, or effectually captivating upon success in battle, — all works of great violence and impetuousness.
I might manifest fully, from that description we have of it, Rom. vii., how it will darken the mind, extinguish convictions, dethrone reason, interrupt the power and influence of any considerations that may be brought to hamper it, and break through all into a flame. But this is not my present business. Now, the first thing in mortification is the weakening of this habit of sin or lust, that it shall not, with that violence, earnestness, frequency, rise up, conceive, tumultuate, provoke, entice, disquiet, as naturally it is apt to do, James i. 14, 15.
I shall desire to give one caution or rule by the way, and it is this: Though every lust doth in its own nature equally, universally, incline and impel to sin, yet this must be granted with these two limitations:—
[1.] One lust, or a lust in one man, may receive many accidental improvements, heightenings, and strengthenings, which may give it life, power, and vigour, exceedingly above what another lust hath, or the same lust (that is, of the same kind and nature) in another man. When a lust falls in with the natural constitutions and temper, with a suitable course of life, with occasions, or when Satan hath got a fit handle to it to manage it, as he hath a thousand ways so to do, that lust grows violent and impetuous above others, or more than the same lust in another man; then the steams of it darken the mind so, that though a man knows the same things as formerly, yet they have no power nor influence on the will, but corrupt affections and passions are set by it at liberty.
But especially, lust gets strength by temptation. When a suitable temptation falls in with a lust, it gives it a new life, vigour, power, violence, and rage, which it seemed not before to have or to be capable of. Instances to this purpose might be multiplied; but it is the design of some part of another treatise to evince this observation.
[2.] Some lusts are far more sensible and discernible in their violent actings than others. Paul puts a difference between uncleanness and all other sins: 1 Cor. vi. 18, “Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.” Hence, the motions of that sin are more sensible, more discernible than of others; when perhaps the love of the world, or the like, is in a person no less habitually predominant than that, yet it makes not so great a combustion in the whole man.