Amaleki explained that “there is nothing which is good save it comes from the Lord: and that which is evil cometh from the devil” (Omni 1:25; see also Alma 5:40). This is the great litmus test for determining the truthfulness or rightness of a matter- does it invite and entice one to come unto God, to partake of his goodness and grace, to enjoy the fruits of his Spirit, to gain in time those godly attributes and godly powers which will equip the person to be with and be like God? If it does so, it is of God.
Nephi wrote concerning the Book of Mormon: “And now, my beloved brethren, and also Jew, and all ye ends of the earth, hearken unto these words and believe in Christ; and if ye believe not in these words believe in Christ. And if ye shall believe in Christ ye will believe in these words, for they are the words of Christ, and he hath given them unto me; and they teach all men that they should do good.” (2 Nephi 33:10.)