The Book of Mormon: Chapter Twelve: 2 Nephi 25:23
1Now I, Nephi, do speak somewhat concerning the words which I have written, which have been spoken by the mouth of Isaiah. For behold, Isaiah spake many things which were hard for many of my people to understand; for they know not concerning the manner of prophesying among the Jews.
2For I, Nephi, have not taught them many things concerning the manner of the Jews; for their works were works of darkness, and their doings were doings of abominations.
3Wherefore, I write unto my people, unto all those that shall receive hereafter these things which I write, that they may know the judgments of God, that they come upon all nations, according to the word which he hath spoken.
One of the most fallacious doctrines originated by Satan and propounded by man is that man is saved alone by the grace of God; that belief in Jesus Christ alone is all that is needed for salvation. . . . One passage in the Book of Mormon, written perhaps . . . to stress and induce appreciation for the gracious gift of salvation offered on condition of obedience . . . is particularly enlightening: ‘For we labor diligently to write, to persuade our children, and also our brethren, to believe in Christ, and to be reconciled to God; for we know that it is by grace that we are saved, after all we can do.’ (2 Nephi 25:23; italics added.) . . .
. . . However good a person’s works, he could not be saved had Jesus not died for his and everyone else’s sins. And however powerful the saving grace of Christ, it brings exaltation to no man who does not comply with the works of the gospel.
Of course we need to understand terms. If by the word salvation is meant the mere salvation or redemption from the grave, the ‘grace of God’ is sufficient. But if the term salvation means returning to the presence of God with eternal progression, eternal increase, and eventual godhood, for this one certainly must have the ‘grace of God,’ as it is generally defined, plus personal purity, overcoming of evil, and the good ‘works’ made so important in the exhortations of the Savior and his prophets and apostles (Spencer W. Kimball, Teachings of Spencer W. Kimball, pp. 70–71).