Hibikukagayaku
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
First, it's a bit difficult, but let's think about whether there really is a past or future.
The “past” that has already passed away is already past, so it is no longer in the “present.” Of course, when I think of the “past,” I have the illusion that it “exists,” but what comes to mind is just my “present.” Also, the “future,” which is yet to come, has yet to come, so of course it cannot be in the “present.” I imagine the “future,” and I have the illusion that it “exists,” but the self I imagine is my “present.” Also, even if you say “present,” it actually disappeared in “present” the moment you said it. The “present” itself is basically “impossible” unless time can be stopped.
So, when it comes to what can be said, it can be assumed that there is a current moment, a continuum of moments. Of course, this does not mean that there is no “past” or “future.” For the time being, compared to the “present,” it can be said that it “exists” in the world in general, but if analyzed strictly, it will become something impossible as an “entity.”
Now, what I can say here is that, in fact, we are only originally living for “only one moment in the present (momentary continuum).”
Of course, without my past, I wouldn't be where I am now. Furthermore, if you don't have your current self, your future self is impossible as a possibility. My past and present self are clearly connected, and it can be said that my current self is also connected to my future self, so I'm not different, but of course I can't say that it's the same. This is difficult, but it is called “not uniform.”
It has been described painfully up to this point, but in conclusion, in other words, once you understand how you are “living only in the present moment (moment continuum),” you will naturally be able to concentrate on this moment by moment and spend your time carefully and cherish it.
Of course, I still have a long way to go, but as much as possible, I want to spend my days taking good care of my days without getting too caught up in the past or the future yet to come.
Kawaguchi Hidetoshi Gassho