11 O. If you remember what has been said you would know that you have been already answered; but in yielding to the love of contradiction you have wandered from the subject, like those persons who are talkative rather than eloquent, and who, when they cannot argue, still continue to wrangle. On the present occasion it is not my aim to either accuse or defend the Arians, but rather to get safely past the turning-post of the race, and to maintain that we receive a bishop for the same reason that you receive a layman.
If you grant forgiveness to the erring, I too pardon the penitent. If he that baptizes a person into our belief has had no injurious effect upon the person baptized, it follows that he who consecrates a bishop in the same faith causes no defilement to the person consecrated. Heresy is subtle, and therefore the simple-minded are easily deceived. To be deceived is the common lot of both layman and bishop. But you say, a bishop could not have been mistaken. The truth is, men are elected to the episcopate who come from the bosom of Plato and Aristophanes.
How many can you find among them who are not fully instructed in these writers? Indeed all, whoever they may be, that are ordained at the present day from among the literate class make it their study not how to seek out the marrow of Scripture, but how to tickle the ears of the people with the flowers of rhetoric. We must further add that the Arian heresy goes hand in hand with the wisdom of the world, and borrows its streams of argument from the fountains of Aristotle. And so we will act like children when they try to outdo one another— whatever you say I will say: what you assert, I will assert: whatever you deny, I will deny.
We allow that an Arian may baptize; then he must be a bishop. If we agree that Arian baptism is invalid, you must reject the layman, and I must not accept the bishop. I will follow you wherever you go; we shall either stick in the mud together, or shall get out together.
Source: The Dialogue Against the Luciferians (New Advent)