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My first example concerns Satan’s efforts to corrupt a person who has an unusual commitment to one particular doctrine or commandment of the gospel of Jesus Christ. This could be an unusual talent for family history work, an extraordinary commitment to constitutional government, a special gift in the acquisition of knowledge, or any other special talent or commitment.
In a memorable message given at the 1971 October conference, Elder Boyd K. Packer likened the fulness of the gospel to a piano keyboard. He reminded us that a person could be “attracted by a single key,” such as a doctrine they want to hear “played over and over again.” He explained:
Some members of the Church who should know better pick out a hobby key or two and tap them incessantly, to the irritation of those around them. They can dull their own spiritual sensitivities. They lose track that there is a fulness of the gospel, . . . [which they reject] in preference to a favorite note. This becomes exaggerated and distorted, leading them away into apostasy. [Boyd K. Packer, Teach Ye Diligently (Salt Lake City: Bookcraft, 1975), p. 44]
We could say of such persons, as the Lord said of the members of the Shaker sect in a revelation given in 1831, “Behold, I say unto you, that they desire to know the truth in part, but not all” (D&C 49:2). And so, I say, beware of a hobby key. If you tap one key to the exclusion or serious detriment of the full harmony of the gospel keyboard, Satan can use your strength to bring you down.
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Dallin H. Oaks