After delivering his blockbuster vision, Peter finished his letter with words of encouragement and exhortation.
not that many people know the Apostle Peter also had a heavily eschatological message.
Necessarily, thieves do not announce their expected time of arrival, as that would be counterproductive. In the same way, Jesus’s return is certain and imminent, but kept under wraps.
In Peter’s mind, the creation of the world and the judgment of the Flood acted are proofs of God's impending judgment by fire.