The following are words from the Prophet Joseph Fielding Smith: “I now say—
That Joseph Smith is the one to whom all men must look in this day to learn the truth about Christ and his gospel;
That in due course the name of this prophet shall be known in every corner of the earth and among all people;
That the honest in heart will accept him as a prophet and will worship that Lord whom he revealed;
That the church that he organized by divine command prospers because it follows the revelations that came through him;
And that all who believe the teachings of Joseph Smith and labor in the course set by him shall come to a knowledge that Jesus Christ is the Son of God who was crucified for the sins of the world.
In the same way that I know Jesus is the Christ—and that is by revelation from the Holy Spirit—I know that Joseph Smith is and was and everlastingly shall be a prophet of God.”
Source: Special Witnesses