My take on this topic is that time is how consciousness experiences reality.
If there was no framework of time at all, then we would all experience the past, present, and future simultaneously. We do not.
Which is why past lives are in the past.
Sure, we can tune into vivid memories of former lifetimes and the Interlife (or period in-between incarnations) in mystical experiences related to meditation and channeling, but that is not the same thing as actually being there.
Our past (i.e., this particular time-line) cannot be changed one iota, the present can be altered depending on our actions and inactions, and there are possible futures as well as probable futures.
Change the present and you change the future.
Granted, if it were possible to travel faster than the speed of light for time travel, would it also be possible to venture into one or more parallel time-lines in the distant past?
I believe so.
But is it possible to venture into a future that has yet to exist?
I highly doubt it, as there would be no where to go
To sum up, time exists but only for us to experience reality, as that is its purpose.
[edit on 21-3-2007 by Paul_Richard]


Measuring a six inch ruler with that six inch ruler its self is all ready equated. It's within,
remember? Just as in the case of the ruler: Existence, consciousness, us, only need know the self to measure the self and to realize that it is
immeasurable 'out side of the self', which would be that nothingness (outside of Existence) and cause it to recognize its never ending presence
Thus time never began and time will never end, time is a creation of human reality/illusion 