Steve Gregg looks at what "the coming of Jesus Christ" means in this instance, what "the morning star rises in your hearts" refers to, and easily dispels the Roman Catholic myth that only church leaders can interpret scripture.
2 Peter 1:16-21
New King James Version (NKJV)
The Trustworthy Prophetic Word
19 And so we have the prophetic word confirmed,[a] which you do well to heed as a light that shines in a dark place, until the day dawns and the morning star rises in your hearts; 20 knowing this first, that no prophecy of Scripture is of any private interpretation,[b] 21 for prophecy never came by the will of man, but holy men of God[c] spoke as they were moved by the Holy Spirit.