Here are the relevant excerpts : https://old.reddit.com/r/books/comments/1jqpar/what_book_sin...
We are mere "Animals" with a far more complex social structure than any other species which is why we invent all sorts of "subjective meanings" to "objectively meaningless" life. How to reconcile both is the eternal "Human Condition" problem.
See also : Philosophy in a Meaningless Life: A System of Nihilism, Consciousness and Reality by James Tartaglia. Free pdf at - https://www.bloomsburycollections.com/monograph?docid=b-9781...