When Peter said some things in Paul’s letters are hard to understand, he must’ve had this chapter in mind.
Return of Christ
Did Jesus know everything God knows? Yes and no.
For Paul, the Kingdom is not merely a future expectation. It has already broken into history at the resurrection of Jesus.
Knowing the nearness of Jesus can bring peace and hope to the loneliness and uncertainty of the waiting room.
It may be the most important doctrine you never think about.