8 How do you suffer persecution and enmity for righteousness' sake, when, according to you, it is righteous to preach and teach these impieties? The wonder is, that the gentleness of Christian times allows such perverse iniquity to pass wholly or almost unpunished. And yet, as if we were blind or silly, you tell us that your suffering reproach and persecution is a great proof of your righteousness. If people are just according to the amount of their suffering, atrocious criminals of all kinds suffer much more than you.
But, at any rate, if we are to grant that suffering endured on account of any sort of profession of Christianity proves the sufferer to be in possession of true faith and righteousness, you must admit that any case of greater suffering that we can show proves the possession of truer faith and greater righteousness. Of such cases you know many among our martyrs, and chiefly Cyprian himself, whose writings also bear witness to his belief that Christ was born of the Virgin Mary. For this faith, which you abhor, he suffered and died along with many Christian believers of that day, who suffered as much, or more.
Faustus, when shown to be a Manichæan by evidence, or by his own confession, on the intercession of the Christians themselves, who brought him before the proconsul, was, along with some others, only banished to an island, which can hardly be called a punishment at all, for it is what God's servants do of their own accord every day when they wish to retire from the tumult of the world. Besides, earthly sovereigns often by a public decree give release from this banishment as an act of mercy.
And in this way all were afterwards released at once. Confess, then, that they were in possession of a truer faith and a more righteous life, who were accounted worthy to suffer for it much more than you ever suffered. Or else, cease boasting of the abhorrence which many feel for you, and learn to distinguish between suffering for blasphemy and suffering for righteousness. What it is you suffer for, your own books will show in a way that deserves your most particular attention.
Source: Reply to Faustus the Manichaean (New Advent)