Zechariah said to the angel, "But how am I to be sure of this? I am an old man myself, and my wife is advanced in years."

they went and woke him up. "Master, master," they cried, "we are drowning!" So he woke up and checked the wind and the surf; they ceased and there was a calm.

Be sure that if the householder had known at what hour the thief was coming, he would not have allowed his house to be broken into.

He also told the following parable to certain persons who were sure of their own goodness and looked down upon everybody else.

But whenever you see Jerusalem surrounded by armies, then be sure her desolation is not far away.

So, whenever you see all this happen, be sure the Reign of God is at hand.