I answer that, Christ prayed for Himself in two ways. First, by expressing the desire of His sensuality, as stated above (A. 2); or also of His simple will, considered as a nature; as when He prayed that the chalice of His Passion might pass from Him (Matt. 26:39). Secondly, by expressing the desire of His deliberate will, which is considered as reason; as when He prayed for the glory of His Resurrection (John 17:1). And this is reasonable. For as we have said above (A. 1, ad 1) Christ wished to pray to His Father in order to give us an example of praying; and also to show that His Father is the author both of His eternal procession in the Divine Nature, and of all the good that He possesses in the human nature. Now just as in His human nature He had already received certain gifts from His Father. so there were other gifts which He had not yet received, but which He expected to receive. And therefore, as He gave thanks to the Father for gifts already received in His human nature, by acknowledging Him as the author thereof, as we read (Matt. 26:27; John 11:41): so also, in recognition of His Father, He besought Him in prayer for those gifts still due to Him in His human nature, such as the glory of His body, and the like. And in this He gave us an example, that we should give thanks for benefits received, and ask in prayer for those we have not as yet.
Reply Obj. 1: Hilary is speaking of vocal prayer, which was not necessary to Him for His own sake, but only for ours. Whence he says pointedly that "His word of beseeching did not benefit Himself." For if "the Lord hears the desire of the poor," as is said in the Ps. 9:38, much more the mere will of Christ has the force of a prayer with the Father: wherefore He said (John 11:42): "I know that Thou hearest Me always, but because of the people who stand about have I said it, that they may believe that Thou hast sent Me."
Reply Obj. 2: Christ wished indeed to suffer what He suffered, at that particular time: nevertheless He wished to obtain, after His passion, the glory of His body, which as yet He had not. This glory He expected to receive from His Father as the author thereof, and therefore it was fitting that He should pray to Him for it.
Reply Obj. 3: This very glory which Christ, while praying, besought for Himself, pertained to the salvation of others according to Rom. 4:25: "He rose again for our justification." Consequently the prayer which He offered for Himself was also in a manner offered for others. So also anyone that asks a boon of God that he may use it for the good of others, prays not only for himself, but also for others. _______________________
FOURTH ARTICLE [III, Q. 21, Art. 4]
Whether Christ's Prayer Was Always Heard?
Objection 1: It would seem that Christ's prayer was not always heard.
For He besought that the chalice of His passion might be taken from
Him, as we read (Matt. 26:39): and yet it was not taken from Him.
Therefore it seems that not every prayer of His was heard.
Obj. 2: Further, He prayed that the sin of those who crucified Him might be forgiven, as is related (Luke 23:34). Yet not all were pardoned this sin, since the Jews were punished on account thereof. Therefore it seems that not every prayer of His was heard.
Obj. 3: Further, our Lord prayed for them "who would believe in Him through the word" of the apostles, that they "might all be one in Him," and that they might attain to being with Him (John 17:20, 21, 24). But not all attain to this. Therefore not every prayer of His was heard.
Obj. 4: Further, it is said (Ps. 21:3) in the person of Christ: "I shall cry by day, and Thou wilt not hear." Not every prayer of His, therefore, was heard.