Palea [Paucapalea, a pupil of Gratian]:

Heretics, when disputing,[L] place the whole strength of their
wits upon the dialectic art, which, in the judgment of
philosophers, is defined as having the power not of aiding but of
destroying study. But the dialectic art was not pleasing[M] to
God the Father, Son, and Holy Spirit, for the Kingdom of God is
in the simplicity of faith, not in contentious speech.

Also Rabanus on the Afflictions of the Church:

The blessed Jerome is beaten by an angel because he was reading
the works of Cicero.

We read about the blessed Jerome that when he was reading the
works (_e_) of Cicero he was chidden by an angel because, being a
Christian man, he was devoting himself to the productions of the
pagans.

[The discussion which follows, to "Hence Bede," etc., p. 66, is
attributed, in modern editions, to Gratian.]

Hence, too, the prodigal son in the Gospel is blamed because he
would fain have filled his belly with the husks (_f_) which the
swine did eat.

Hence, too, Origen understands by the flies and frogs with which
the Egyptians were smitten, the empty garrulousness of the
dialecticians and their sophistical arguments.