Another occasion of temptation is on the part of the devil, who always "envies those who strive for better things," as Ambrose says (In Luc. iv, 1). And such occasions of temptation are not to be avoided. Hence Chrysostom says (Hom. v in Matth. [*From the supposititious Opus Imperfectum]): "Not only Christ was led into the desert by the Spirit, but all God's children that have the Holy Ghost. For it is not enough for them to sit idle; the Holy Ghost urges them to endeavor to do something great: which is for them to be in the desert from the devil's standpoint, for no unrighteousness, in which the devil delights, is there. Again, every good work, compared to the flesh and the world, is the desert; because it is not according to the will of the flesh and of the world." Now, there is no danger in giving the devil such an occasion of temptation; since the help of the Holy Ghost, who is the Author of the perfect deed, is more powerful* than the assault of the envious devil. [*All the codices read 'majus.' One of the earliest printed editions has 'magis,' which has much to commend it, since St. Thomas is commenting the text quoted from St. Chrysostom. The translation would run thus: 'since rather is it (the temptation) a help from the Holy Ghost, who,' etc.].
Reply Obj. 3: Some say that all the temptations took place in the desert. Of these some say that Christ was led into the Holy City, not really, but in an imaginary vision; while others say that the Holy City itself, i.e. Jerusalem, is called "a desert," because it was deserted by God. But there is no need for this explanation. For Mark says that He was tempted in the desert by the devil, but not that He was tempted in the desert only. _______________________
THIRD ARTICLE [III, Q. 41, Art. 3]
Whether Christ's Temptation Should Have Taken Place After His Fast?
Objection 1: It would seem that Christ's temptation should not have taken place after His fast. For it has been said above (Q. 40, A. 2) that an austere mode of life was not becoming to Christ. But it savors of extreme austerity that He should have eaten nothing for forty days and forty nights, for Gregory (Hom. xvi in Evang.) explains the fact that "He fasted forty days and forty nights," saying that "during that time He partook of no food whatever." It seems, therefore, that He should not thus have fasted before His temptation.
Obj. 2: Further, it is written (Mk. 1:13) that "He was in the desert forty days and forty nights; and was tempted by Satan." Now, He fasted forty days and forty nights. Therefore it seems that He was tempted by the devil, not after, but during, His fast.
Obj. 3: Further, we read that Christ fasted but once. But He was tempted by the devil, not only once, for it is written (Luke 4:13) "that all the temptation being ended, the devil departed from Him for a time." As, therefore, He did not fast before the second temptation, so neither should He have fasted before the first.
On the contrary, It is written (Matt. 4:2, 3): "When He had fasted forty days and forty nights, afterwards He was hungry": and then "the tempter came to Him."
I answer that, It was becoming that Christ should wish to fast before His temptation. First, in order to give us an example. For since we are all in urgent need of strengthening ourselves against temptation, as stated above (A. 1), by fasting before being tempted, He teaches us the need of fasting in order to equip ourselves against temptation. Hence the Apostle (2 Cor. 6:5, 7) reckons "fastings" together with the "armor of justice."
Secondly, in order to show that the devil assails with temptations even those who fast, as likewise those who are given to other good works. And so Christ's temptation took place after His fast, as also after His baptism. Hence since rather Chrysostom says (Hom. xiii super Matth.): "To instruct thee how great a good is fasting, and how it is a most powerful shield against the devil; and that after baptism thou shouldst give thyself up, not to luxury, but to fasting; for this cause Christ fasted, not as needing it Himself, but as teaching us."