[…] I will not approve even of this man despairing of himself, although he may have gone on to extreme old age in the practice of this great and unspeakable wickedness.
For if the wrath of God were a passion, one might well despair as being unable to quench the flame which he had kindled by so many evil doings.
But since the Divine nature is passionless, even if He punishes, even if He takes vengeance, he does this not with wrath, but with tender care, and much loving-kindness.
Therefore it behoves us to be of much good courage, and to trust in the power of repentance.
For even those who have sinned against Him He is not wont to visit with punishment for His own sake; for no harm can traverse that divine nature.
But He acts with a view to our advantage, and to prevent our perverseness becoming worse by our making a practice of despising and neglecting Him.
One who places himself outside the light inflicts no loss on the light, but inflicts the greatest loss upon himself being shut up in darkness.
He who has become accustomed to despise that almighty power does no injury to the power, but inflicts the greatest possible injury upon himself.
And for this reason God threatens us with punishments, and often inflicts them, not as avenging Himself, but by way of attracting us to Himself.
For a physician also is not distressed or vexed at the insults of those who are out of their minds, but yet does and contrives everything for the purpose of stopping those who do such unseemly acts, not looking to his own interests but to their profit.
And if they manifest some small degree of self-control and sobriety he rejoices and is glad, and applies his remedies much more earnestly, not as revenging himself upon them for their former conduct, but as wishing to increase their advantage, and to bring them back to a purely sound state of health.
Even so God when we fall into the very extremity of madness, says and does everything, not by way of avenging Himself on account of our former deeds; but because He wishes to release us from our disorder.
John Chrysostom (c.347-407): An exhortation to Theodore after his fall, 1, 4 (slightly adapted).