Thomas Aquinas

“ Further, we need not ask in prayer for what we know for certain will happen; thus, we do not pray that the sun may rise tomorrow. Nor is it fitting that anyone should ask in prayer for what he knows will not happen. ”

“ Wherefore every absolute will of Christ, even human, was fulfilled, because it was in conformity with God; and consequently His every prayer was fulfilled. For in this respect also is it that other men's prayers are fulfilled, in that their will is in conformity with God, according to Rom. 8:27: "And He that searcheth the hearts knoweth," that is, approves of, "what the Spirit desireth," that is, what the Spirit makes the saints to desire: "because He asketh for the saints according to God," that is, in conformity with the Divine will. ”

“ Although the sensuality wished what the reason besought, it did not belong to the sensuality to seek this by praying, but to the reason, as stated above.
Reply to Objection 3: The union in person is according to the personal being, which pertains to every part of the human nature; but the uplifting of prayer is by an act which pertains only to the reason, as stated above. ”

“ SS, Q [83] , AA [1] ,2, prayer is the unfolding of our will to God, that He may fulfill it. If, therefore, there had been but one will in Christ, viz. the Divine, it would nowise belong to Him to pray, since the Divine will of itself is effective of whatever He wishes by it, according to Ps. 134:6: "Whatsoever the Lord pleased, He hath done." But because the Divine and the human wills are distinct in Christ, and the human will of itself is not efficacious enough to do what it wishes, except by Divine power, hence to pray belongs to Christ as man and as having a human will. ”

“ Lastly, Ambrose, Origen and Chrysostom say that He prayed thus "as man," being reluctant to die according to His natural will.
Thus, therefore, whether we understand, according to Hilary, that He thus prayed that other martyrs might be imitators of His Passion, or that He prayed that the fear of drinking His chalice might not trouble Him, or that death might not withhold Him, His prayer was entirely fulfilled. But if we understand that He prayed that He might not drink the chalice of His passion and death ”