Adam Clarke on Romans 16:19

For your obedience is come abroad - The apostle gives this as a reason why they should continue to hear and heed those who had led them into the path of truth, and avoid those false teachers whose doctrines tended to the subversion of their souls.

Yet I would have you wise - I would wish you carefully to discern the good from the evil, and to show your wisdom, by carefully avoiding the one and cleaving to the other.