Also : Sisyphus.

The concept of life as meaningless, to be happy with the drudgery, or repetition, instead to be happy with the 'journey', to be in each moment.

Very common throughout literature/history.

I'd like to think we are somehow different, that modern man with technology is reaching some new level, to find some purpose. But now, not so sure, it's still just day-in-day-out, then you die.

https://en.wikipedia.org/wiki/Sisyphus https://en.wikipedia.org/wiki/The_Myth_of_Sisyphus