When one speaks by the power of the Holy Spirit, the words uttered are counted as scripture, whatsoever they shall speak when moved upon by the Holy Ghost shall be scripture, shall be the will of the Lord, shall be the mind of the Lord, shall be the word of the Lord, shall be the voice of the Lord, and the power of God unto salvation (DC 68:4). Because of this principle, Nephi knew that the things which he was constrained by the Spirit to speak must surely come to pass.