Moroni knew what it was like for the gifts of God to be done away among a people because he surely saw that among the Nephites before they were destroyed. He would have seen that whenever a person among the Nephites did good they did so by exercising godly gifts.
On a separate note I am impressed again this morning that the Book of Mormon is the foundation for conversion in the latter days. Studying the church—doctrine or culture—without seriously asking if the Book of Mormon is literally the word of God as it claims will rarely if ever lead to conversation and no person can retain a testimony of the Book of Mormon while rejecting the restored gospel or maintain a testimony of the restored gospel while rejecting the Book of Mormon.
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