"A grown up has forgotten how to be whole-hearted about anything. While he does one thing he cares already about another." - Maria von Trapp

For some reason we have a tendency to believe that we "have" a past, a present, and a future. Is it possible to "have" these things?
What do these words represent?
Time.
How does one truly "have" time?
Past is what? memories, writings, photos?
No, those things are evidence that the past happened.
Where you are in this moment is perhaps a product of the past or things accomplished or done in the past, but once they are done can it truly be said that one has them still? That these things accomplished are in one's possession?
I don't think so.
And future becomes even more complicated because one can never be certain that it in fact exists or that one indeed has one.
It seems then, that the only piece of time one can truly claim to "have" is the present. This present moment.
As such it seems it would be rather inadvisable to spend significant amounts of time--in the realm of thought or otherwise--in any of the other two places, and rather advisable to attempt to eliminate these thoughts and concentrate on doing only that which this present moment requires.