City of God

And consequently, even if some of these virgins killed themselves to avoid such disgrace, who that has any human feeling would refuse to forgive them? And as for those who would not put an end to their lives, lest they might seem to escape the crime of another by a sin of their own, he who lays this to their charge as a great wickedness is himself not guiltless of the fault of folly. For if it is not lawful to take the law into our own hands, and slay even a guilty person, whose death no public sentence has warranted, then certainly he who kills himself is a homicide, and so much the guiltier of his own death, as he was more innocent of that offense for which he doomed himself to die.

Do we justly execrate the deed of Judas, and does truth itself pronounce that by hanging himself he rather aggravated than expiated the guilt of that most iniquitous betrayal, since, by despairing of God's mercy in his sorrow that wrought death, he left to himself no place for a healing penitence? How much more ought he to abstain from laying violent hands on himself who has done nothing worthy of such a punishment! For Judas, when he killed himself, killed a wicked man; but he passed from this life chargeable not only with the death of Christ, but with his own: for though he killed himself on account of his crime, his killing himself was another crime.

Why, then, should a man who has done no ill do ill to himself, and by killing himself kill the innocent to escape another's guilty act, and perpetrate upon himself a sin of his own, that the sin of another may not be perpetrated on him?