8 Teaching us this, what says he? “O Lord, how glorious are Your works: Your thoughts are made very deep”. Verily, my brethren, there is no sea so deep as these thoughts of God, who makes the wicked flourish, and the good suffer: nothing so profound, nothing so deep: therein every unbelieving soul is wrecked, in that depth, in that profundity. Do you wish to cross this depth? Remove not from the wood of Christ's Cross: you shall not sink: hold yourself fast to Christ.
What do I mean by this, hold fast to Christ? It was for this reason that He chose to suffer on earth Himself. You have heard, while the prophet was being read, how He “did not turn away His back from the smiters, and His face from the spittings of men,” how “He turned not His cheek from their hands;” wherefore chose He to suffer all these things, but that He might console the suffering? He could have raised His flesh at the last day: but then you would not have had your ground of hope, since you had not seen Him.
He deferred not His resurrection, that you might not still be in doubt. Suffer then tribulation in the world with the same end as that which you have observed in Christ: and let not those who do evil, and flourish in this life, move you. “Your thoughts are very deep.” Where is the thought of God? Rejoice not as the fish who is exulting in his bait: the fisherman has not drawn his hook: the fish has as yet the hook in his jaws. And what seems to you long, is short; all these things pass over quickly.
What is the long life of man to the eternity of God? Do you wish to be of long-suffering? Consider the eternity of God. For you regard your few days, and in your few days thou dost wish all things to be fulfilled. What things? The condemnation of all the wicked: and the crowning of all the good: do you wish these things to be fulfilled in your days? God fulfills them in His own time. Why do you suffer weariness? He is eternal: He waits: He is of long-suffering: but you say, I am not of long-suffering, because I am mortal. But you have it in your power to become so: join your heart to the eternity of God, and with Him you shall be eternal....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)