15 And it came to pass that Nephi--having been visited by angels and also the voice of the Lord, therefore having seen angels, and being eye-witness, and having had power given unto him that he might know concerning the ministry of Christ, and also being eye-witness to their quick return from righteousness unto their wickedness and abominations;

16 Therefore, being grieved for the hardness of their hearts and the blindness of their minds--went forth among them in that same year, and began to testify, boldly, repentance and remission of sins through faith on the Lord Jesus Christ.

17 And he did minister many things unto them; and all of them cannot be written, and a part of them would not suffice, therefore they are not written in this book. And Nephi did minister with power and with great authority.