But the end of all things is near. Therefore be of sound mind, self-controlled, and sober in prayer.
But the end of all things is at hand ...  Although, as pointed out above, it is the sobriety and prayerful watchfulness of the Christians which Peter sought to inspire by these words, it is most likely that this has no reference whatever to the Second Coming of Christ.  The time of Peter's writing was about 65 A.D.; and what took place within the next five or six years explains this verse perfectly as a true prophecy of what happened: