Link to lesson.
Fascinating that Joseph Smith accurately predicted the future growth of the LDS Church on the very day the church was organized: "...you know no more concerning the destinies of this Church and kingdom than a babe upon its mother’s lap. You don’t comprehend it...It is only a little handful of Priesthood you see here tonight, but this Church will fill North and South America—it will fill the world."
I suppose anyone with a lot of hope about a new church could say something like that so in some ways it doesn't qualify as a prophesy that is evidence of his prophetic powers. But it does at least demonstrate that he had tremendous faith in the Church and its potential.
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