Al-Hasan said: "Verily you have insufficient time, your actions are
sealed, death is looking over you and the Fire is in front of you. And
by Allah whatever you see (i.e. the world) is going. So expect the
decision of Allah every day and night, and let one look to what he has put forward for himself."
He also said:
"O son of Adam! You are nothing but days, whenever a day goes past,
a part of you (also) goes."
Al-Hasan quote taken from:http://forums.almaghrib.org/showthread.php?t=34755