The Book of Mormon is an absolutely remarkable text of religious psychology. At various points in the text, certain terms are used to make fine distinctions between very specific states of mind and heart. And the consequences of these states of mind and heart are spelled out in terms of social trends in communities.
When I say I know the Book of Mormon is true, part of that statement includes my conviction that it conveys real history of real people and real phenomena. The other part of that statement is that its unique picture of religious psychology is accurate. This morning, my reading in 3 Nephi reinforced this conviction in me.