“When the uncertain future becomes the past, the past in turn becomes uncertain.”

“Past is dead
Future is uncertain;
Present is all you have,
So eat, drink and live merry.”

“It is obvious: The past was once the future and the future will become the past.”

“The past is… much more uncertain—or even falsely reported—than is usually recognized.”

“You are the only young man that I know of who ignores the fact that the future becomes the present, the present the past and the past turns into everlasting regret if you don't plan for it!”

“Remember, the past need not become our future as well.”

“Never has the future become so rapidly the past.”

“The future is uncertain but the end is always near.”

“The future is no more uncertain than the present.”

“With each passing moment I'm becoming part of the past. There is no future for me, just the past steadily accumulating.”