Mark 13:21 - 37

Jesus reminds His follower of the certainty of the Kingdom, while at the same time reminding them that the timing of the arrival of the Kingdom is unknown.  Those who claim to have "inside knowledge" and "secret revelation" about the day, date, hour or even year of His return are lying.  Jesus' own words are "do not believe it."  God does not reveal that information, so that all will be vigilant at all times.  It could be today!