The restoration of the original predisposition to good in us is not therefore the acquisition of a lost incentive for the good, since we were never able to lose the incentive that consists in respect for the moral law … The restoration is therefore only the recovery of the purity of the law, as the supreme ground of all our maxims, according to which the law itself is to be incorporated into the power of choice, not merely bound to other incentives, nor indeed subordinated to them as conditions, but rather in its full purity, as the self-sufficient incentive of that power. (6:46)

Kant believes that we can never truly lose our predisposition to do what is right. We can, however, place our illicit, immoral desires ahead of our more respectable moral inclinations. In this quotation, Kant says that true moral behavior consists of subordinating our illicit, immoral desires to our respect for the moral law. We will always have self-serving, immoral impulses and desires, but as long as we quash them, we are behaving morally. Kant urges us to think of moral law as the ultimate ruler of our decisions, not as one consideration among many.