Peter appears to address a variety of issues in his two short letters. However, his consistent mission was obvious. He is teaching the Torah and messages from the Tanakh.
This was a picture of the Kingdom when it comes. Transfiguration essentially means “transformed.” This was a picture of Yeshua in His resurrected state along with Elijah and Moses. In this vision, Moses and Elijah are both transformed also. Moses represents those who have died in faithfulness to Elohim. Elijah represents those who will not taste death before He returns. When Yeshua returns, those dead in Messiah will be raised and those still alive will be caught up in the air to be with Him. We do not know what we will be like, but we know we will be like Him (1 John 3:2).
The term “the devil” is the Greek word “diablos.” It is also translated as “malicious gossip.”