This is important:
For we did not follow cleverly devised myths when we made known to you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of his majesty.
Not only was Peter one of the first disciples called (Matthew 4:18-20), Peter was a witness of the transfiguration (Matthew 17:1-9) and heard the voice of God.
He was still speaking when, behold, a bright cloud overshadowed them, and a voice from the cloud said, “This is my beloved Son, with whom I am well pleased; listen to him.”
But he knew this eyewitness would soon be gone. So he did something. He wrote this letter.
And I will make every effort so that after my departure you may be able at any time to recall these things.
And in this letter he wanted to share the "confirmed word".
And we have the prophetic word more fully confirmed, to which you will do well to pay attention as to a lamp shining in a dark place, until the day dawns and the morning star rises in your hearts, knowing this first of all, that no prophecy of Scripture comes from someone's own interpretation.
The Gospel was present in the prophets (See “Case Dismissed” and the notes on Job 32-37 for example), but dimly lit.
Peter encourages them to look to the now “confirmed” (bebaios – something that you can stand on, or better yet walk on) word. This is not a different word, but the same word only explained. Because prophecy is not the result of a person’s thought process [Ellicot points us to the verb form of “interpretation” (epilysis) in Mark 4:34 as “explained” (epilyō)], it needs to be explained.
For example, as each parable was told by Jesus, there was often a collective “Hugh?” in response.
When many of his disciples heard it, they said, “This is a hard saying; who can listen to it?”
They would then need an interpreter, which Jesus often did privately:
· Parable of the Sower – Matthew 13:3-23
· Parable of the Weeds – Matthew 13:24-43
· Parable of the Net – Matthew 13:47–50
Not only did the lack of an explanation prohibit the understanding, one’s eye may itself also be “bad”/”evil”/”dark” (ponēros) and one's heart may be a "dark place".
Matthew 6:22-23
“The eye is the lamp of the body. So, if your eye is healthy, your whole body will be full of light, but if your eye is bad, your whole body will be full of darkness. If then the light in you is darkness, how great is the darkness!
The use of ponēros also in Matthew 6:22-23, underscores the petition in the Lord’s prayer to “deliver us from evil” and explains how a “bad” eye can flood the person with darkness.
And lead us not into temptation,but deliver us from evil.