The Second Apology 9Eternal punishment not a mere threat.

And that no one may say what is said by those who are deemed philosophers, that our assertions that the wicked are punished in eternal fire are big words and bugbears, and that we wish men to live virtuously through fear, and not because such a life is good and pleasant; I will briefly reply to this, that if this be not so, God does not exist; or, if He exists, He cares not for men, and neither virtue nor vice is anything, and, as we said before, lawgivers unjustly punish those who transgress good commandments. But since these are not unjust, and their Father teaches them by the word to do the same things as Himself, they who agree with them are not unjust. And if one object that the laws of men are diverse, and say that with some, one thing is considered good, another evil, while with others what seemed bad to the former is esteemed good, and what seemed good is esteemed bad, let him listen to what we say to this. We know that the wicked angels appointed laws conformable to their own wickedness, in which the men who are like them delight; and the right Reason, when He came, proved that not all opinions nor all doctrines are good, but that some are evil, while others are good. Wherefore, I will declare the same and similar things to such men as these, and, if need be, they shall be spoken of more at large. But at present I return to the subject.