In like manner the divers degrees of charity are distinguished according to the different pursuits to which man is brought by the increase of charity. For at first it is incumbent on man to occupy himself chiefly with avoiding sin and resisting his concupiscences, which move him in opposition to charity: this concerns beginners, in whom charity has to be fed or fostered lest it be destroyed: in the second place man's chief pursuit is to aim at progress in good, and this is the pursuit of the proficient, whose chief aim is to strengthen their charity by adding to it: while man's third pursuit is to aim chiefly at union with and enjoyment of God: this belongs to the perfect who "desire to be dissolved and to be with Christ."
In like manner we observe in local motion that at first there is withdrawal from one term, then approach to the other term, and thirdly, rest in this term.
Reply Obj. 1: All these distinct degrees which can be discerned in the increase of charity, are comprised in the aforesaid three, even as every division of continuous things is included in these three—the beginning, the middle, and the end, as the Philosopher states (De Coelo i, 1).
Reply Obj. 2: Although those who are beginners in charity may progress, yet the chief care that besets them is to resist the sins which disturb them by their onslaught. Afterwards, however, when they come to feel this onslaught less, they begin to tend to perfection with greater security; yet with one hand doing the work, and with the other holding the sword as related in 2 Esdr. 4:17 about those who built up Jerusalem.
Reply Obj. 3: Even the perfect make progress in charity: yet this is not their chief care, but their aim is principally directed towards union with God. And though both the beginner and the proficient seek this, yet their solicitude is chiefly about other things, with the beginner, about avoiding sin, with the proficient, about progressing in virtue. _______________________
TENTH ARTICLE [II-II, Q. 24, Art. 10]
Whether Charity Can Decrease?
Objection 1: It would seem that charity can decrease. For contraries by their nature affect the same subject. Now increase and decrease are contraries. Since then charity increases, as stated above (A. 4), it seems that it can also decrease.
Obj. 2: Further, Augustine, speaking to God, says (Confess. x) "He loves Thee less, who loves aught besides Thee": and (Qq. lxxxiii, qu. 36) he says that "what kindles charity quenches cupidity." From this it seems to follow that, on the contrary, what arouses cupidity quenches charity. But cupidity, whereby a man loves something besides God, can increase in man. Therefore charity can decrease.
Obj. 3: Further, as Augustine says (Gen. ad lit. viii, 12) "God makes the just man, by justifying him, but in such a way, that if the man turns away from God, he no longer retains the effect of the Divine operation." From this we may gather that when God preserves charity in man, He works in the same way as when He first infuses charity into him. Now at the first infusion of charity God infuses less charity into him that prepares himself less. Therefore also in preserving charity, He preserves less charity in him that prepares himself less. Therefore charity can decrease.