The Divine Institutes

Constancy is a virtue; not that we resist those who injure us, for we must yield to these; and why this ought to be done I will show presently: but that when men command us to act in opposition to the law of God, and in opposition to justice, we should be deterred by no threats or punishments from preferring the command of God to the command of man. Likewise it is a virtue to despise death; not that we seek it, and of our own accord inflict it upon ourselves, as many and distinguished philosophers have often done, which is a wicked and impious thing; but that when compelled to desert God, and to betray our faith, we should prefer to undergo death, and should defend our liberty against the foolish and senseless violence of those who cannot govern themselves, and with fortitude of spirit we should challenge all the threats and terrors of the world.

Thus with lofty and invincible mind we trample upon those things which others fear— pain and death. This is virtue; this is true constancy— to be maintained and preserved in this one thing alone, that no terror and no violence may be able to turn us away from God. Therefore that is a true sentiment of Cicero: “No one,” he says, “can be just who fears death, or pain, or exile, or want.” Also of Seneca, who says, in his books of moral philosophy: “This is that virtuous man, not distinguished by a diadem or purple, or the attendance of lictors, but in no respect inferior, who, when he sees death at hand, is not so disturbed as though he saw a fresh object; who, whether torments are to be suffered by his whole body, or a flame is to be seized by his mouth, or his hands are to be stretched out on the cross, does not inquire what he suffers, but how well.”

But he who worships God suffers these things without fear. Therefore he is just. By these things it is effected, that he cannot know or maintain at all either the virtues or the exact limits of the virtues, whoever is estranged from the religion of the one God.