Matthew 26:37

(Lib. 83. Quæst. q. 80.) We have the narratives of the Evangelists, by which we know that Christ was both born of the Blessed Virgin Mary, was seized by the Jews, scourged, crucified, put to death, and buried in a tomb, all which cannot be supposed to have taken place without a body, and not even the maddest will say that these things are to be understood figuratively, when they are told by men who wrote what they remembered to have happened. These then are witnesses that He had a body, as those affections which cannot be without mind prove Him to have had a mind, and which we read in the accounts of the same Evangelists, that Jesus wondered, was angry, was sorrowful. (de. Civ. Dei, xiv. 9.) Since then these things are related in the Evangelists, they are not surely false, but as when He willed He became Man, so likewise when He willed He took into His human soul these passions for the sake of adding assurance to the dispensation. We indeed have these passions by reason of the weakness of our human nature; not so the Lord Jesus, whose weakness was of power.

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.

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? […]

He had accepted the disciples’ faith and the devotedness of their will, but He foresaw that they would be troubled and scattered abroad, and therefore bade them sit still in their places; for to sit belongs to one at ease, but they would be grievously troubled that they should have denied Him. In what fashion He went forward it describes, And taking with him Peter and the two sons of Zebedee, he began to be sorrowful and very heavy; the same to whom He had shewn His glory in the mount. By this place are overthrown the Manichæans, who said that He took an unreal body; and those also who said that He had not a real soul, but His Divinity in place of a soul

(Verse 37) And taking with him Peter and the two sons of Zebedee, he began to be sad and sorrowful. What we have said above about the passion and pre-passion is also shown in the present chapter, that the Lord, in order to prove the truth of his assumption as a man, was truly saddened, but so that the passion would not dominate his soul, he began to be saddened through pre-sorrow. For it is one thing to be saddened, and another thing to begin to be saddened. But He was saddened not by the fear of suffering, for which He had come, that He might suffer; and He had reprimanded Peter for his timidity; but on account of the most unfortunate Judas, and the scandal of all the apostles, and the rejection of the Jewish people, and the destruction of miserable Jerusalem. Hence Jonas also, grieving over the withering of a gourd or a ivy, was grieved (Jonah 4), unwilling to lose his former shelter. But if the sadness of the soul is interpreted by the heretics not as the affection of the Savior towards those who are about to perish, but as the suffering, let them answer how they explain that which is said through Ezekiel in the person of God: And in all these things you have saddened me (Ezekiel 16, Septuagint version).