Remigius of Auxerre
Catena Aurea · Matthäusevangelium 10
Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves. But beware of men: for they will deliver you up to the councils, and they will scourge you in their synagogues; And ye shall be brought before governors and kings for my sake, for a testimony against them and the Gentiles.
Beautifully the Lord bids the preacher have the wisdom of the serpent; because the first man was beguiled by a serpent; as though He had said, The foe is subtle to deceive, be ye therefore wise to rescue; he commended the tree, do ye also commend the tree of the Cross.