[T Minus Four]

I know that Joseph Smith was called of God to be a prophet

C'mon Norm, you must have more to go on than a feeling. Don't you even have some evidence?

[Normandy]

Hi TM4,

I have the proof I need; the testimony of the Holy Ghost.

God has also given another form of proof:

http://scriptures.lds.org/en/bm/thrwtnss

These testimonies, along with the Book of Mormon itself are, according to the Lord, sufficent to stand as a witness to the world. See Ether Chapter 5 in the Book of Mormon:

http://scriptures.lds.org/en/ether/5