> Otherwise you get effects like;
> * Just take drugs, feel meaningless "joy" because that's what you value,
> * Don't do anything less "joyful" even though it's more meaningful.
These are entirely valid positions to take though. Obtaining knowledge for knowledge's sake isn't objectively more meaningful, even if it may be subjectively more valuable to you.You could make the point that teaching, and thus furthering the collective knowledge of our species, may be somewhat objectively meaningful, because you impact the trajectory of humanity. But unless you draw joy from that specific fact alone, the joy from creating knowledge is just as selfish as taking drugs to attain a state of bliss (which, again, I don't oppose either.)
Also, I'd even challenge the notion that knowledge alone, at its face value, automatically equates to a benefit for humanity. Harari has made that point far more eloquently than I in Nexus.