What is the reason for human beings to live?
Einstein said, "If you stop learning, you start to die."
Even if there are no people left, if you write it in a notebook, everything will remain. The more knowledge you have, the more the knowledge flowers will bloom. And the world can be made even more beautiful.
The dead grandpa was a doctor. He didn't give up learning only when he was completely deaf. The ability to learn brought up excellent doctors.
There are times when we are not aware of it, but humans live by learning. If you don't like learning, you'll have no reason to live. So learn, or die.