Whosoever revolteth, and continueth not in the doctrine of Christ, hath not God. He that continueth in the doctrine, the same hath both the Father and the Son. If any man come to you, and bring not this doctrine, receive him not into the house nor say to him, God speed you. For he that saith unto him, God speed you, communicateth with his wicked works. (Second John 1: 9-11)

Concerning the above passage, Bishop Challoner commented,

Nor say to him, God speed you. This admonition is in general, to forewarn the faithful of the dangers which may arise from a familiarity with those who have prevaricated and gone from the true faith, and with such as teach false doctrine. But this is not forbidding a charity for all men, by which we ought to wish and pray for the eternal salvation of every one, even of our enemies.

Our Lord’s Doctrine is, in His Mind, immutable, and thus in eternal reality immutable, even though vain men try to modernize, mutate and adulterate it with worldly doctrine, making it unworthy to be called His Doctrine (See Third Nephi). God created our first parents; He alone knows exactly how our hearts and minds work. He also formulated for our sake the only Doctrine that is worthy to run human hearts and minds: the Doctrine of Christ.—MK