Most religious orders in our modern day are prone to take a moderate stance toward a single true church; many claim that “all roads lead to Rome,” that all churches teach the truth, and that because God is so merciful everyone will eventually inherit heaven’s blessings. Doctrines are thus diluted and witnesses watered down such that (at least in the minds of a surprising number of modernists) all notions of “one Lord, one faith, and one baptism” are nullified through an undiscriminating ecumenism.
“They Shall Teach with Their Learning”
To preach something which is true (note that it must be true!) by “some other way”—meaning by the power of human reason and intellect—is to undertake a work which is “not of God.” That is to say a does not have the ratifying and confirming power which always accompanies an inspired and heaven-sent utterance. It is not the way the Lord himself would have done it. Indeed, the word of the Master Teacher is both a command and a prophecy: “And the Spirit shall be given unto you by the prayer of faith: and if ye receive not the Spirit ye shall not teach” (D&C 42:14).
“They Shall Teach with Their Learning”
This is a prophetic warning against the notion that one must be formally trained for the ministry, in which case the sophistries of men become the object of their trust, rather than the quiet whisperings of the Spirit.
When men or women begin to discuss the principles and doctrines associated with salvation, they must do so under the influence of the Holy Ghost in order for their words to have convincing power; otherwise there is no lasting learning, no communication of saving verities, no commitment or conversion.
The “law of the teacher” is set forth in modern revelation as follows: “Verily I say unto you, he that is ordained of me and sent forth to preach the word of truth by the Comforter, in the Spirit of truth, cloth he preach it by the Spirit of truth or some other way? And if it he by some other way it is not of God. And again, he that receiveth the word of truth, cloth he receive it by the Spirit of truth or some other way?
If it be some other way it is not of God. Therefore, why is it that ye cannot understand and know, that he that receiveth the word by the Spirit of truth receiveth it as it is preached by the Spirit of truth? Wherefore, he that preacheth and he that receiveth, understand one another, and both are edified and rejoice together.” (D&C 50:17-22.)