End and beginning are mind constructs as well. That makes existence the only thing that could ever be important.
To add to
Mindful 's list of incomprehensible's -- we don't even know what existence is.
Rene Descartes pointed out to us that since we think therefore we exist.
However that's as far as he took it.
Everybody in Philosophy has been wondering about that ever since.
Which begs the age old question: is the moon still there when we are not looking at it?
The Moon is only a few minutes away -- as is the Sun as well.
Wait a couple of minutes and they both will probably still be shining/reflecting.
What is a bigger dilemma is that of the stars -- they could be all gone by now -- billions of years ago.
That one too. We're gazing at the past.
Wrap your head round that one.
Human thought as far back as we can tell in history was dominated by superstition and religion.
Then a bunch of Greeks starting with Hesiod and Thales came along and tried to make sense out of it all WITHOUT resorting to superstition or religion. Back in those days Zeus was the Supreme God, and his brothers, sisters, children, aunts, and uncles were all Gods.
Thales was the first of many philosophers who discovered that pure human thought can explain many things without need for superstition or religion.
As Philosophy then progressed, and it caught up with mathematicians such as Copernicus and experimenters such as Galileo, then Science was born.
Science is the applied philosophy of physical things -- the Universe, stars, Sun, Moon, planets, comets, asteroids and meteors, all living things, and all Earthly characteristics, such as the sky, ground, oceans, rives and streams, rain and weather, etc.
Turns out that Agamemnon did not need to sacrifice his daughter Iphrgenia to get a favorable wind for his ships to sail to Troy -- a low pressure system would have blown through eventually giving him first a headwind and then a tailwind and finally a crosswind to get there.
The Gods had nothing to do with it for Agamemnon.
Science tells us that light travels at 186 thousand miles per second. Therefore from any star, planet, or moon shining or reflecting light at us, it will take the light time to cover that distance, since they are all more than 186 thousand miles away.
The Moon is 238.9 thousand miles away, so that light takes not quite 2 seconds to reach us.
The Sun is 93 million miles away, so that light takes slightly more than 8 seconds to reach us.
Science gives us these answers.
A mile, by the way, is 2000 steps taken by a Roman solder while marching. This equals 1.61 kilometers, which is an international French modern measure. These are merely conventions or definition. Mathematics is all about definitions and then manipulating those definitions. As such mathematics really does not exist outside of human minds.