here is some more info:
Tropologically this “cup” is martyrdom and affliction, and the obstinate resistance that we make to sin, even unto death, says S. Basil, in his comments on Ps. cxvi. For Paul eagerly longed for martyrdom, and hence he speaks not of the cross, but of the cup of salvation, as though he should say: I will readily drink whatever the Lord may have given to me, even though it be the martyr’s death; and therefore knowing, says S. Augustine, that martyrdom is not within my own power, but depends on the grace of God, I will call upon that grace, and will publicly preach and celebrate the name of the Lord. Similarly, Christ speaks of His Passion as a cup, and bids His Apostles and martyrs and all His members drink of it (S. Matt. xx. 22, and xxvi. 42). As, then, every Christian offers to Christ, His Deliverer, the Eucharistic cup and sacrifice as a thanksgiving, so does Paul offer his sufferings, his afflictions, and death to Christ, as a most pleasing cup. So, too, have all the martyrs, by openly professing their faith and dying for it, offered to Christ the cup of their martyrdom.
I believed
. I believed, and I still believe. This is a continuous act of belief, and not merely one that is inchoate, especially so since **David speaks of the person of Paul and of us all, and puts his own belief forward as one deserving our imitation. **Ver. 14.—Shall raise up us also . . . and shall present us with you. Shall present us with you in glory. He says out of modesty, “shall present us with you,” not “you with us,” because the Corinthians were the cause and object of his preaching, and so also of his glory.
Ver. 15.—That the abundant grace might redound to the glory of God. I.e., through many giving thanks. The Syriac renders it, “that since grace abounds through many, thanksgiving may be proportionately multiplied to the glory of God.”
Ver. 16.—But though our outward man perish. Though the body be corrupted through persecutions, afflictions, hunger, thirst, cold, nakedness, scourgings, and diseases, yet the spirit within is renewed, and advances in faith, hope, charity, readiness of mind, and, like gold from the fire, comes out stronger and brighter, says Chrysostom.
This verse differs from Rom. vii. 22. There the outward man is concupiscence, or the man governed by concupiscence; the inward man is charity, or the man renewed by the spirit. But here the outward man is the body, the inward is the soul; or, more appositely, the outward man is the man regarded as corporeal, or in so far as through his body he is visible, tangible, passible, and susceptible of injuries from without; the inward man is the same man regarded as possessed of a soul, or in so far as through his soul he is invisible, and bravely and cheerfully bears bodily afflictions. Since man consists of two so dissimilar parts, the body without and the soul within, and since the soul itself seems to have two sides, one which animates the body, and shows itself outwardly in the body by its working and passions, and so seems in a sense outward, animal, and
