Here Augustine explains the necessary and important role of trials in the Christian life. Without the discipline of trials, temptations and chastisements, there would be no true spiritual growth. Chastisement means that God has truly adopted us as sons.
Scripture says: God chastises every son whom he acknowledges. But the bad shepherd says: “Perhaps I will be exempt”. If he is exempt from the suffering of his chastisements, then he is not numbered among God’s sons. You will say: “Does God indeed punish every son?” Yes, every one, just as he chastised his only Son. His only Son, born of the substance of the Father, equal to the Father in the form of God, the Word through whom all things were made, he could not be chastised. For this reason he was clothed with flesh so that he might know chastisement. God punishes his only Son who is without sin; does he then leave unpunished an adopted son who is with sin? The Apostle says that we have been called to adoption.
We have been adopted as sons, that we might be co-heirs with the only Son, and also that we might be his inheritance: Ask of me and I will give you the nations as your inheritance. Christ gave us the example by his own sufferings.
But clearly one who is weak must neither be deceived with false hope nor broken by fear. Otherwise he may fail when temptations come. Say to him: Prepare your soul for temptation. Perhaps he is starting to falter, to tremble with fear, perhaps he is unwilling to approach. You have another passage of Scripture for him: God is faithful. He does not allow you to be tempted beyond your strength. Make that promise while preaching about the sufferings to come, and you will strengthen the man who is weak. When someone is held back because of excessive fear, promise him God’s mercy. It is not that temptations will be lacking, but that God will not permit anyone to be tempted beyond what he can bear. In this manner you will be binding up the broken one.
When they hear of the trials that are coming, some men arm themselves more and, so to speak, are eager to drain the cup. The ordinary medicine of the faithful seems to them but a small thing; for their part they seek the glorious death of the martyrs. Others hear of the temptations to come, and when they do arrive, as arrive they must, they become broken and lame. Yet it is right that such things befall the Christian, and no one esteems them except the one who desires to be a true Christian.
Offer the bandage of consolation, bind up what has been broken. Say this: “Do not be afraid. God in whom you have believed does not abandon you in temptations. God is faithful. He does not allow you to be tempted beyond your strength. It is not I who say this, but the Apostle, and he says further: Are you willing to accept his trial, the trial of Christ who speaks in me? When you hear this you are hearing it from Christ himself, you are hearing it from the shepherd who gives pasture to Israel. For of him it was said: You will give us tears to drink in measure. The Apostle says: He does not allow you to be tempted beyond your strength. This is also what the prophet intends by adding the words: in measure. God rebukes but also encourages, he brings fear and he brings consolation, he strikes and he heals. Do not reject him”.
This excerpt on God’s chastisement of his sons and the discipline of trials, chastisements and temptations comes from a sermon by St. Augustine On Pastors (Sermo 46, 11-12: CCL 41, 538-539). It is used in the Roman Catholic office of readings for Saturday of the 24th Week in ordinary time.