Here is what Joseph Smith said regarding the rights of the Latter Day Saints to “embrace all, and every item of truth”:
“… Mormonism is truth, in other words the doctrine of the Latter-day Saints, is truth. … The first and fundamental principle of our holy religion is, that we believe that we have a right to embrace all, and every item of truth, without limitation or without being circumscribed or prohibited by the creeds or superstitious notions of men, or by the dominations of one another, when that truth is clearly demonstrated to our minds, and we have the highest degree of evidence of the same.”
– Letter from Joseph Smith to Isaac Galland, Mar. 22, 1839, Liberty Jail, Liberty, Missouri, published in Times and Seasons, Feb. 1840, pp. 53–54; spelling and grammar modernized.
“And not only this, but those things which never have been revealed from the foundation of the world, but have been kept hid from the wise and prudent, shall be revealed unto babes and sucklings in this, the dispensation of the fulness of time.”
Would to God, brethren, I could tell you who I am! Would to God I could tell you what I know! But you would call it blasphemy, and there are men upon this stand who would want to take my life.
“Mormonism” includes all truth. There is no truth but what belongs to the Gospel. It is life, eternal life; it is bliss; it is the fulness of all things in the gods and in the eternities of the gods.
...those things that were presented unto your minds by the Spirit of God, will come to pass; and thus by learning the Spirit of God and understanding it, you may grow into the principle of revelation, until you become perfect in Christ Jesus.