If you're in Star Trek V: The Final Frontier and "God"'s eyes are glowing in response to your query to why he needs a starship, let's just say you're not going to get an honest answer.
Death's library in sometimes functions like a Magical Database, instantly delivering books on very obscure subjects when he requests them, or writing out fresh text if his query doesn't require a long answer (the "some of the sheep" response from The Last Continent).