This is a nice summary of the Book of Mormon thus far. Nephi has only written that which is designed to persuade us to do good, to let the posterity of Lehi know about their ancestors, to speak of Jesus and persuade us to endure to the end (see verse 4). At the same time, Nephi has spoken harshly against sin in a plain fashion. He knows that what he has written, which he feels to be inadequate, will someday be a strength to his posterity. Of all Nephi has written, his last chapter teaches us the most about Nephi himself.