John Chrysostom
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.
Their consolation under their hardships was the excellent power of Him who sent them; wherefore He puts that before all, Lo, I send you. Be not dismayed, though you be sent into the midst of wolves; for I am able to bring it to pass that you suffer no hurt, and that ye should not only prevail over the wolves, but be made more terrible than lions. But it is good that it should be thus; hereby your virtue is made brighter, and My power is more manifested. Also that somewhat should proceed from themselves, that they should not think themselves to be crowned without reason, He adds, Be ye therefore wise as serpents, simple as doves.