§ 160. The preaching, teaching, and profession, of divine truth in all its purity, and the administration of the sacraments in full accordance with their divine institution, are the criteria of the true or orthodox visible church of Christ on earth.
John 8:31–32 Then said Jesus to those Jews which believed on Him, If ye continue in My Word, then are ye My disciples indeed; and ye shall know the truth, and the truth shall make you free.
Matthew 28:20 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.