HKB
Whether Constancy Pertains to Perseverance?
Objection 1: It seems that constancy does not pertain to perseverance. For constancy pertains to patience, as stated above (Q. 137, A. 5): and patience differs from perseverance. Therefore constancy does not pertain to perseverance.
Obj. 2: Further, "virtue is about the difficult and the good." Now it does not seem difficult to be constant in little works, but only in great deeds, which pertain to magnificence. Therefore constancy pertains to magnificence rather than to perseverance.
Obj. 3: Further, if constancy pertained to perseverance, it would seem nowise to differ from it, since both denote a kind of unchangeableness. Yet they differ: for Macrobius (In Somn. Scip. i) condivides constancy with firmness by which he indicates perseverance, as stated above (Q. 128, A. 6). Therefore constancy does not pertain to perseverance.
On the contrary, One is said to be constant because one stands to a thing. Now it belongs to perseverance to stand to certain things, as appears from the definition given by Andronicus. Therefore constancy belongs to perseverance.
I answer that, Perseverance and constancy agree as to end, since it belongs to both to persist firmly in some good: but they differ as to those things which make it difficult to persist in good. Because the virtue of perseverance properly makes man persist firmly in good, against the difficulty that arises from the very continuance of the act: whereas constancy makes him persist firmly in good against difficulties arising from any other external hindrances. Hence perseverance takes precedence of constancy as a part of fortitude, because the difficulty arising from continuance of action is more intrinsic to the act of virtue than that which arises from external obstacles.
Reply Obj. 1: External obstacles to persistence in good are especially those which cause sorrow. Now patience is about sorrow, as stated above (Q. 136, A. 1). Hence constancy agrees with perseverance as to end: while it agrees with patience as to those things which occasion difficulty. Now the end is of most account: wherefore constancy pertains to perseverance rather than to patience.
Reply Obj. 2: It is more difficult to persist in great deeds: yet in little or ordinary deeds, it is difficult to persist for any length of time, if not on account of the greatness of the deed which magnificence considers, yet from its very continuance which perseverance regards. Hence constancy may pertain to both.
Reply Obj. 3: Constancy pertains to perseverance in so far as it has something in common with it: but it is not the same thing in the point of their difference, as stated in the Article.
FOURTH ARTICLE [II-II, Q. 137, Art. 4]
Whether Perseverance Needs the Help of Grace? [*Cf. I-II, Q. 109, A. 10]
Objection 1: It seems that perseverance does not need the help of grace. For perseverance is a virtue, as stated above (A. 1). Now according to Tully (De Invent. Rhet. ii) virtue acts after the manner of nature. Therefore the sole inclination of virtue suffices for perseverance. Therefore this does not need the help of grace.
Obj. 2: Further, the gift of Christ's grace is greater than the harm brought upon us by Adam, as appears from Rom. 5:15, seqq. Now "before sin man was so framed that he could persevere by means of what he had received," as Augustine says (De Correp. et Grat. xi). Much more therefore can man, after being repaired by the grace of Christ, persevere without the help of a further grace.
Obj. 3: Further, sinful deeds are sometimes more difficult than deeds of virtue: hence it is said in the person of the wicked (Wis. 5:7): "We . . . have walked through hard ways." Now some persevere in sinful deeds without the help of another. Therefore man can also persevere in deeds of virtue without the help of grace.
On the contrary, Augustine says (De Persev. i): "We hold that perseverance is a gift of God, whereby we persevere unto the end, in Christ."