Why did the early Saints believe Joseph Smith was a seer?

How do we account for Joseph Smith knowing his parents were coming (when within three-quarters of a mile from his house), having an impression to come out of the well and meet Emma not far from his house, knowing the exact time David Whitmer would arrive, knowing the Whitneys prayed for Joseph to come to Kirtland, being able to see the safety of the plates using the Urim and Thummim, knowing Bishop Whitney’s travel the next day, seeing those who died in Zion’s Camp, knowing the Lord would send him deliverance from debt, knowing a sermon would be preached in Jackson county before the close of 1838, knowing a Quaker man was an adulterer, seeing the plot of the city of Kirtland in a vision, having the plan of the Kirtland temple given by the Lord, seeing in vision the pattern of the Nauvoo temple, and knowing the Lord would put it into the heart of somebody to send Joseph money for Zion’s camp?

Keith Perkins reports one experience of David Whitmer:

David was to witness even more miracles that would convince him of the divinity of the work of Joseph Smith. Driving to Harmony—a three-day trip—he was astonished to find the Prophet and Oliver Cowdery walking out to meet him as though they knew his travel schedule. David asked how they had known the exact time of his arrival. David recalled, “Oliver told me that Joseph had informed him when I started from home, where I stopped the first night, how I read the sign at the tavern, where I stopped the second night, etc., and that I would be there that day before dinner.” This was only one of many such incidents when the Prophet demonstrated to the Saints that he truly was a seer.
– Keith W. Perkins – True to the Book of Mormon – The Whitmers

How would Joseph have been able to convince so many that he was a seer?

See:

Keith W. Perkins – True to the Book of Mormon – The Whitmers

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