When speaking about the person and teaching of Manes, Archelaus (bishop of Caschar) not-so-subtlely states:
And, in good truth, I hold Marcion, and Valentinian, and Basilides, and other heretics to be sainted men when compared with this person.
Ouch! But Archelaus goes on to explain himself:
For they did display a certain kind of intellect, and they did, indeed, think themselves capable of understanding all Scripture, and did thus constitute themselves as leaders for those who were willing to listen to them. But notwithstanding this, not one of these dared to proclaim himself to be God, or Christ, or the Paraclete, as this fellow has done, who is ever disputing, on some occasions about the ages, and on others about the sun, and how these objects were made, as though he were superior to them himself; for every person who offers an exposition of the method in which any object has been made, puts himself forward as superior to and older than the subject of his discussion. But who may venture to speak of the substance of God, unless, it may be, our Lord Jesus Christ alone?
—The Acts of the Disputation with the Heresiarch Manes 38.