Gregory the Dialogist

And ye shall not find iniquity in my tongue, nor shall foolishness sound through my jaws. As if it were expressed in plain words, 'The more exactly ye weigh your own words, the more truly ye estimate those of others, and when what ye say begins to be right, ye will recognise what ye hear to be just. …

Morals on the Book of Job, Book VIII ↗

Thomas Aquinas

The third impediment exists when someone in a disputation does not aim at the truth but at victory or glory, as happens in law cases or sophistical debates. "In speaking, judge what is right," i.e. to concede what seems to be true to you, and deny those things which seem false. "And" if you do this, "You will find no evil on my tongue," i.e. anything contrary to the justice which is due to one's neighbor. "Nor stupidity in my mouth," i.e. anything against the wisdom by which one thinks correctly about God. …

Commentary on Job ↗