The Cross of Christ is the source of all blessings
From a sermon of Saint Leo the Great

How marvellous the power of the cross; how great beyond all telling the glory of the passion: here is the judgement-seat of the Lord, the condemnation of the world, the supremacy of Christ crucified.

Your cross is the source of all blessings, the cause of all graces. Through the cross the faithful receive strength from weakness, glory from dishonor, life from death. The different sacrifices of animals are no more: the one offering of your body and blood is the fulfillment of all the different sacrificial offerings, for you are the true Lamb of God: you take away the sins of the world. In yourself you bring to perfection all mysteries, so that, as there is one sacrifice in place of all other sacrificial offerings, there is also one kingdom gathered from all peoples.

Dearly beloved, let us then acknowledge what Saint Paul, the teacher of the nations, acknowledged so exultantly: This is a saying worthy of trust, worthy of complete acceptance: Christ Jesus came into this world to save sinners.The power of his death once confronted our death. In the words of Hosea the prophet: Death, I shall be your death; grave, I shall swallow you up. By dying he submitted to the laws of the underworld; by rising again he destroyed them. He did away with the everlasting character of death so as to make death a thing of time, not of eternity. As all die in Adam, so all will be brought to life in Christ.

“In my deepest wound I saw your glory and it dazzled me.”
– St. Augustine of Hippo

Saint Augustine on the Psalms

Hear, O God, my petition, listen to my prayer. Who is speaking? An individual, it seems. See if it is an individual: I cried out to you from the ends of the earth while my heart was in anguish. Now it is no longer one person; rather, it is one in the sense that Christ is one, and we are all his members. What single individual can cry from the ends of the earth? The one who cries from the ends of the earth is none other than the Son’s inheritance. It was said to him: Ask of me, and I shall give you the nations as your inheritance, and the ends of the earth as your possession. This possession of Christ, this inheritance of Christ, this body of Christ, this one Church of Christ, this unity that we are, cries from the ends of the earth. What does it cry? What I said before: Hear, O God, my petition, listen to my prayer; I cried out to you from the ends of the earth.’ That is, I made this cry to you from the ends of the earth; that is, on all sides.

Why did I make this cry? While my heart was in anguish. The speaker shows that he is present among all the nations of the earth in a condition, not of exalted glory but of severe trial.
Our pilgrimage on earth cannot be exempt from trial. We progress by means of trial. No one knows himself except through trial, or receives a crown except after victory, or strives except against an enemy or temptations.

The one who cries from the ends of the earth is in anguish, but is not left on his own. Christ chose to foreshadow us, who are his body, by means of his body, in which he has died, risen and ascended into heaven, so that the members of his body may hope to follow where their head has gone before.

He made us one with him when he chose to be tempted by Satan. We have heard in the gospel how the Lord Jesus Christ was tempted by the devil in the wilderness. Certainly Christ was tempted by the devil. He suffered temptation in your nature, but by his own power gained victory for you.

If in Christ we have been tempted, in him we overcome the devil. Do you think only of Christ’s temptations and fail to think of his victory? See yourself as tempted in him, and see yourself as victorious in him. He could have kept the devil from himself; but if he were not tempted he could not teach you how to triumph over temptation.