Come Follow Me: D&C 23-26
This is a series of brief revelations to Joseph, some of his family members, Oliver and Joseph Knight. Interestingly, the Lord tells all but one of them they are under no condemnation. They are in good standing with God.
However, Joseph Knight was a different story. He was called upon to pray in public, but turned down the offer. Later, as he attempted to pray in private, he was seized upon by a devil. He told his family to get Joseph, who came and performed the first casting out of a devil in Church history. Joseph Knight was called in this revelation to join the Church, which he did. He remained faithful his entire life.
In this revelation, Joseph is called to visit the congregations of the Church that were beginning to grow. He is told that he would never have abilities concerning temporal things, but only in spiritual things. We will see many of his temporal adventures will fail - such as the Kirtland Safety Society (a bank). At his death, Joseph held all the debt of the Church, which included loans for building the Nauvoo temple. Even as a prophet in Missouri, he would be forced to make ends meet by chopping wood for others in winter, so his own family could eat.
Imagine being the chosen one of God as a prophet, and being told this. If Joseph Smith were a fraud, one would imagine he would instead seek to be financially secure by receiving the tithes and offerings of his followers. Instead, he worked harder than most temporally, just to make ends meet, and then tack upon that his spiritual role that had him traveling, and often in hiding from his persecutors.