"No one knows about that day or hour,
not even the angels in heaven, nor
the Son, but only the Father.
Therefore keep watch, because
you do not know on what day
your Lord will come. But understand
this: If the owner of the house had
known at what time of night the
thief was coming, he would have
kept watch and would not have let
his house be broken into. So you
must also be ready, because the
Son of Man will come at an hour
when you do not expect him."
Matthew 24:36, 42-44