Nicene and Post-Nicene Fathers, Vol. II:
City of God: Chapter 22

Chapter 22.—That Suicide Can Never Be Prompted by Magnanimity.

But they who have laid violent hands on themselves are perhaps to be admired for their greatness of soul, though they cannot be applauded for the soundness of their judgment.  However, if you look at the matter more closely, you will scarcely call it greatness of soul, which prompts a man to kill himself rather than bear up against some hardships of fortune, or sins in which he is not implicated.  Is it not rather proof of a feeble mind, to be unable to bear either the pains of bodily servitude or the foolish opinion of the vulgar?  And is not that to be pronounced the greater mind, which rather faces than flees the ills of life, and which, in comparison of the light and purity of conscience, holds in small esteem the judgment of men, and specially of the vulgar, which is frequently involved in a mist of error?  And, therefore, if suicide is to be esteemed a magnanimous act, none can take higher rank for magnanimity than that Cleombrotus, who (as the story goes), when he had read Plato’s book in which he treats of the immortality of the soul, threw himself from a wall, and so passed from this life to that which he believed to be better.  For he was not hard pressed by calamity, nor by any accusation, false or true, which he could not very well have lived down; there was, in short, no motive but only magnanimity urging him to seek death, and break away from the sweet detention of this life.  And yet that this was a magnanimous rather than a justifiable action, Plato himself, whom he had read, would have told him; for he would certainly have been forward to commit, or at least to recommend suicide, had not the same bright intellect which saw that the soul was immortal, discerned also that to seek immortality by suicide was to be prohibited rather than encouraged.

Again, it is said many have killed themselves to prevent an enemy doing so.  But we are not inquiring whether it has been done, but whether it ought to have been done.  Sound judgment is to be preferred even to examples, and indeed examples harmonize with the voice of reason; but not all examples, but those only which are distinguished by their piety, and are proportionately worthy of imitation.  For suicide we cannot cite the example of patriarchs, prophets, or apostles; though our Lord Jesus Christ, when He admonished them to flee from city to city if they were persecuted, might very well have taken that occasion to advise them to lay violent hands on themselves, and so escape their persecutors.  But seeing He did not do this, nor proposed this mode of departing this life, though He were addressing His own friends for whom He had promised to prepare everlasting mansions, it is obvious that such ex p. 16 amples as are produced from the “nations that forget God,” give no warrant of imitation to the worshippers of the one true God.