The Book of Mormon is filled with numerous prophecies,
spoken by prophets like Nephi, Abinadi, and Samuel the Lamanite.
On many occasions, Mormon, who abridged the
Nephite record,
went out of his way to show the fulfillment of these prophecies,
sometimes recording entire narratives to prove their accuracy.
Impressively, these prophecies, which are
scattered throughout the entire Book of Mormon,
are often separated from their recorded fulfillment
by large amounts of text.
This suggests that whoever authored the Book
of Mormon knew Nephite history very intimately
and likely worked from some sort of outline.
Yet, according to eyewitnesses,
Joseph Smith dictated the entire text
in a remarkably short amount time without relying on any notes or reference materials.
This provides good evidence that the Book of Mormon was truly written by knowledgeable ancient prophets
whose words and experiential insights
were miraculously revealed to and  through the prophet Joseph Smith.
As readers carefully study the Book of Mormon,
they will see how over and over again the words of its prophets came to pass.
Recognizing this reliable pattern
can build trust that their prophecies about the problems that will arise in our own day
especially their prophetic warnings for us to heed in preparation for the Second Coming of Jesus Christ
will likewise be fulfilled.
And now you know why.
