Hilary of Poitiers

These words, He began to be sorrowful and very heavy, are interpreted by heretics that fear of death assailed the Son of God, being (as they allege) neither begotten from eternity, nor existing in the Father's infinite substance, but produced out of nothing by Him who created all things; and that hence He was liable to anguish of grief, and fear of death. And He who can fear death can also die; and He who can die, though He shall exist after death, yet is not eternal through Him who begot Him in past time. Had these faith to receive the Gospels, they would know that the Word was in the beginning God, and from the beginning with God, and that the eternity of Him who begets and Him who is begotten is one and the same. But if the assumption of flesh infected with its natural infirmity the virtue of that incorruptible substance, so that it became subject to pain, and shrinking from death, it would also become thereby liable to corruption, and thus its immortality being changed into fear, that which is in it is capable of at some time ceasing to be. But God ever is without measure of time, and such as He is, He continues to be eternally. Nothing then in God can die, nor can God have any fear springing out of Himself.

(de Trin. x. 10.) I suppose that there are some who offer here no other cause of His fear than His passion and death. I ask those who think thus, whether it stands with reason that He should have feared to die, who banished from the Apostles all fear of death, and exhorted them to the glory of martyrdom? How can we suppose Him to have felt pain and grief in the sacrament of death, who rewards with life those who die for Him? And what pangs of death could He fear, who came to death of the free choice of His own power? And if His Passion was to do Him honour, how could the fear of His Passion make Him sorrowful?

(in loc.) Since then we read that the Lord was sorrowful, let us discover the causes of His agony. He had forewarned them all that they would be offended, and Peter that he would thrice deny his Lord; and taking him and James and John, He began to be sorrowful. Therefore He was not sorrowful till He took them, but all His fear began after He had taken them; so that His agony was not for Himself, but for them whom He had taken.

When we read that the Lord was sad, we must examine everything that was said to find out why he was sad. He previously warned that they would all fall away. Brimming with confidence, Peter responded that even though all the others might be alarmed, he would not be moved—he who the Lord predicted would deny knowing him three times. In fact, Peter and all the other disciples promised that even in the face of death they would not deny him. He then proceeded on and ordered his disciples to sit down while he prayed. Having brought with him Peter, James and John, he began to grieve. Before he brought them along with him, he did not feel sad. It was only after they had accompanied him that he grew exceedingly sad. His sadness thus arose not from himself but from those whom he had taken with him. It must be realized that the Son of man brought with him none but those whom he showed that he would come into his kingdom at that time when, in the presence of Moses and Elijah on the mountain, he was surrounded by all the splendor of his eternal glory. But the reason for bringing them with him both then and now was the same.

Otherwise; He says not, Let this cup pass away from Me, for that would be the speech of one who feared it; but He prays that it may pass not so as that He should be passed over, but that when it has passed from Him, it may go to another. His whole fear then is for those who were to suffer, and therefore He prays for those who were to suffer after Him, saying, Let this cup pass from me, i. e. as it is drunk by Me, so let it be drunk by these, without mistrust, without sense of pain, without fear of death. He says, If it be possible, because flesh and blood shrink from these things, and it is hard for human bodies not to sink beneath their infliction. That He says, Not as I will, but as thou wilt, He would fain indeed that they should not suffer, lest their faith should fail in their sufferings, if indeed we might attain to the glory of our joint inheritance with Him without the hardship of sharing in His Passion. He says, Not as I will, but as thou wilt, because it is the Father's will that strength to drink of the cup should pass from Him to them, that the Devil might be vanquished not so much by Christ as by His disciples also.

When then He returned to His disciples and found them sleeping, He rebukes Peter, Could ye not watch one hour with me? He addresses Peter rather than the rest, because he had most loudly boasted that he would not be offended.

And why He thus encouraged them to pray that they might not enter into temptation, He adds, For the spirit indeed is willing, but the flesh is weak; this He says not of Himself, but addresses them.

Otherwise, He bare in His own body all the infirmities of us His disciples who should suffer, and nailed to His cross all wherein we are distressed; and therefore that cup cannot pass from Him, unless He drink it, because we cannot suffer, except by His passion.

After His persevering prayer, after His departures and several returns, He takes away their fear, restores their confidence, and exhorts them to sleep on, and take their rest.

Or, He bids them sleep on, and take their rest, because He now confidently awaited His Father's will concerning the disciples, concerning which He had said, Thy will be done, and in obedience to which He drunk the cup that was to pass from Him to us, diverting upon Himself the weakness of our body, the terrors of dismay, and even the pains of death itself.

And whereas, when He returned and found them sleeping, He rebukes them the first time, the second time says nothing, the third time bids them take their rest; the interpretation of this is, that at the first after His resurrection, when He finds them dispersed, distrustful, and timorous, He rebukes them; the second time, when their eyes were heavy to look upon the liberty of the Gospel, He visited them, sending them the Spirit, the Paraclete; for, held back by attachment to the Law, they slumbered in respect of faith; but the third time, when He shall come in His glory, He shall restore them to quietness and confidence.