7 The language of Faustus has the typhus of heresy in it, and is the language of overweening arrogance. "You see in me" he says, "the beatitudes of the gospel; and do you ask if I believe the gospel? You see me poor, meek, a peacemaker, pure in heart, mourning, hungering, thirsting, bearing persecution and enmity for righteousness' sake; and do you doubt my belief in the gospel?" If to justify oneself were to be just, Faustus would have flown to heaven while uttering these words.
I say nothing of the luxurious habits of Faustus, known to all the followers of the Manichæans, and especially to those at Rome. I shall suppose a Manichæan such as Constantius sought for, when he enforced the observance of these precepts with the sincere desire to see them observed. How can I see him to be poor in spirit, when he is so proud as to believe that his own soul is God, and is not ashamed to speak of God as in bondage? How can I see him meek, when he affronts all the authority of the evangelists rather than believe?
How a peacemaker, when he holds that the divine nature itself by which God is whatever is, and is the only true existence, could not remain in lasting peace? How pure in heart, when his heart is filled with so many impious notions? How mourning, unless it is for his God captive and bound till he be freed and escape, with the loss, however, of a part which is to be united by the Father to the mass of darkness, and is not to be mourned for? How hungering and thirsting for righteousness, which Faustus omits in his writings lest, no doubt, he should be thought destitute of righteousness?
But how can they hunger and thirst after righteousness, whose perfect righteousness will consist in exulting over their brethren condemned to darkness, not for any fault of their own, but for being irremediably contaminated by the pollution against which they were sent by the Father to contend?
Source: Reply to Faustus the Manichaean (New Advent)