Church Educational System
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)

Book of Mormon Student Manual (1996 Edition)