3 Nephi 5:18–19

And I know the record which I make to be a just and a true record; nevertheless there are many things which, according to our language, we are not able to write. And now I make an end of my saying, which is of myself, and proceed to give my account of the things which have been before me.

From section: Mormon’s Editorial About his Work and Calling

From page: Mormon Abridges the Nephite Records

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