Jesus predicts the destruction of Jerusalem and end of the age, His second coming. We need to watch and not grow unfaithful until then.
How this is about Jesus
This is the King, telling His subjects: "I'll be back. Be ready."
Sins this reveals
Apathy when the King is delayed.
Fear at tumultuous events, forgetting who is on the throne.
Fear makes you quickly follow any self-proclaimed savior from troubled times.