Nobody can change the past, will we have a tomorrow, or a week or a month? or if there is no tomorrow. How can you say for sure if you have not experienced it yet?
FEAR - False Evidence Appearing Real
http://www.youtube.com/watch?v=txlXcJDtDwM
Isaiah 65: 16 " That he who blesseth himself in the earth shall bless himself in the God of truth; and he that sweareth in the earth shall swear by the God of truth; because the former troubles are forgotten, and because they are hid from mine eyes. "