17 I appeal to you, brethren, to take note of those who create dissensions and difficulties, in opposition to the doctrine which you have been taught; avoid them. 18 For such persons do not serve our Lord Christ, but their own appetites,* and by fair and flattering words they deceive the hearts of the simple-minded. 19 For while your obedience is known to all, so that I rejoice over you, I would have you wise as to what is good and guileless as to what is evil; 20 then the God of peace will soon crush Satan under your feet. The grace of our Lord Jesus Christ be with you.a