support of true doctrine,--in such manner, however, that when he
learns the truth, he rejects the false and the feigned.

Likewise Isidorus in his book of Maxims:

=Why Christians should be forbidden read the productions of the
poets.=

Christians are forbidden to read the productions of the poets
because through the allurements of their fables the mind is too
much stimulated toward the incentives to unlawful desires.

For not only by the offering of incense is sacrifice made to
devils, but also by accepting too readily their sayings.


[Gratian draws the CONCLUSION.]

As therefore is evident from the authorities already quoted
ignorance ought to be odious to priests. Since, if in ignorance
of their own blindness they undertake to lead others, both fall
into the ditch. Wherefore in the Psalm it is said: "Let their
eyes be darkened that they may not see, and bow down their back
always." For when those who go ahead are darkened, they who
follow are easily inclined to bear the burdens of sinners.
Therefore priests must endeavor to cast off ignorance from them
as if it were a sort of pestilence. For although, in a few
instances, it is said that a slave is flogged who does not do his
master's will through ignorance of that will, this is not,
generally understood of all. For the Apostle says: "If any man be