What are we to make of the special witnesses of Christ when they testify of Jesus and his divinity?

The Latter-day prophets and apostles have all shared their testimonies of Jesus Christ in a series entitled “Special Witnesses of Christ”.

President Gordon B. Hinckley testified:

It is He, Jesus Christ, who stands at the head of this Church which bears His sacred name. He is watching over it. He is guiding it. Standing at the right hand of His Father, He directs this work. Unitedly, as His Apostles, authorized and commissioned by Him to do so, we bear our witness that He lives and that He will come again to claim His kingdom and rule as King of Kings and Lord of Lords. Of this we are certain and bear apostolic testimony in His holy name, even the name of Jesus Christ, amen.
– The Church of Jesus Christ of Latter-day Saints – Special Witnesses of Christ

Why would the prophets and apostles testify like this? Why do they have the confidence to speak with certainty?

See:

The Church of Jesus Christ of Latter-day Saints – Current Special Witnesses Videos
The Church of Jesus Christ of Latter-day Saints – Special Witnesses of Christ

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