You spend all of it learning things but forget them all as soon as you die.
Once you die you won't know you are dead, only those you leave behind know you are dead, that's if they ever existed to begin with. Because once you are gone everything you ever knew such as the sun, moon, stars, the whole universe in fact will be gone as well..if it ever existed to begin with.
People scrat a living on this rock laugh and cry, worry and sigh, and never knew where they are or why they are here.
They pigeon hole themselves into groups like religion and politics and so lose their identity as an individual, just becoming part of a flock that follows others.
If you die fighting for a cause you won't remember what that cause was once you are dead. The only people who will remember what you died for will be your family and only for a generation or two, the people who started the war will be remembered for ever.
How ironic it would be if there was such a thing as reincarnation and black men came back as white men, christians came back as Muslims and Russians came back as Ukrainians. Just shows how daft the whole concept of being alive really is.

Enjoy yourself, it's later than you think.