9.

Accordingly, it happens sometimes that one vice is supplanted by another, as the love of money by the love of praise. Occasionally, one vice quits the field that more may take its place, as in the case of the drunkard, who, after becoming temperate in the use of drink, may come under the power of niggardliness and ambition. It is possible, therefore, that vices may give place to vices, not to virtues, as their successors, and thus they are more numerous. When one virtue, however, has entered, there will infallibly be (since it brings all the other virtues along with it) a retreat of all vices whatsoever that were in the man; for all vices were not in him, but at one time so many, at another a greater or smaller number might occupy their place.