For some odd Reason, we tend to Focus much Attention on periods of Time that simply do not exist.
The Past once occurred, yet it’s Now over and cannot Possibly happen again; maybe something similar, though not the same.
Worse, we give a lot of Time to the Negative Events from the Past, with wonderful Experiences often being secondary.
So, all we really Have is the Present, where we unfortunately spend so little Time.
We must be Present to fully appreciate Life.