Rob Smith asked:
Why did the angel take Nephi Plates back to heaven? Do they not belong with man? Would not their existence prove once for all that Mormonism is truth? God allowed the Jews to carry the 10 commandments for several centuries in their original physical form, written by the finger of God Himself!
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Anniversary If you've read the Book of Mormon, that's great. I encourage you to read Joseph Smith's history that you can obtain from the church. Immediately, once word had spread that Joseph Smith had obtained the gold plates, he was faced with opposition. Many were after it for the sake of riches. You can read the trials and tribulations Joseph Smith had encountered once he had obtained the plates. As Ashley had said, we must walk by faith rather than by sight, as believing in God requires faith. The best answer I can give you is that it was Heavenly Father's will.
Ashley He did this because faith is about believing in something and gaining a testimony of it; if we still had the plates there would be no point in believing.