Bonaventure, on Sir 37:12

“Treat not with a man without religion concerning holiness, nor with an unjust man concerning justice, nor with a woman touching her of whom she is jealous, nor with a coward concerning war, nor with a merchant about traffic, nor with a buyer of selling, nor with an envious man of giving thanks,”

“Because it is difficult for a man to be instructed by himself, therefore there is required a counsel by which one is regulated according to the dictate of divinely inspired men. Concerning evil counselors it is written: 'Guard your soul from a counselor. Do not attend to these in every counsel. But be constant with a holy man, whomever you know to observe the fear of God: whose soul is according to your soul.' He gives the reason: because the soul of a holy man at times declares true things more than seven watchmen sitting on high to keep watch, and he sees more than you. We gather from this that one point of counsel consists in this, that a man should not place counsel in himself alone; but he ought to seek counsel from another. Nor does it consist only in this, but also in this, that he know how to discern a counselor and choose the good and flee the evil.”

Imported from an open dataset — not yet checked against the printed edition.