31 The purpose of the tenth book is one in harmony with the faith. For since, in the folly which passes with them for wisdom, the heretics have twisted some of the circumstances and utterances of the Passion into an insolent contradiction of the Divine nature and power of the Lord Jesus Christ, I am compelled to prove that this is a blasphemous misinterpretation, and that these things were put on record by the Lord Himself as evidences of His true and absolute majesty.
In their parody of the faith they deceive themselves with words such as, My soul is sorrowful even unto death. He, they think, must be far removed from the blissful and passionless life of God, over Whose soul brooded this crushing fear of an impending woe, Who under the pressure of suffering even humbled Himself to pray, Father, if it be possible, let this cup pass away from Me, and assuredly bore the appearance of fearing to endure the trials from which He prayed for release; Whose whole nature was so overwhelmed by agony that in those moments on the Cross He cried, My God, My God, why have You forsaken Me?
Forced by the bitterness of His pain to complain that He was forsaken: Who, destitute of the Father's help, gave up the ghost with the words, Father, into Your hands I commend My Spirit. The fear, they say, which beset Him at the moment of expiring made Him entrust His Spirit to the care of God the Father: the very hopelessness of His own condition forced Him to commit His Soul to the keeping of Another.
Source: On the Trinity (New Advent)