A fantastic quote from Neil deGrasse Tyson:
The problem, often not discovered until late in life, is that when you look for things like love, meaning, motivation, it implies they are sitting behind a tree or under a rock. The most successful people recognize, that in life they create their own love, they manufacture their own meaning, they generate their own motivation.
For me, I am driven by two main philosophies, know more today about the world than I knew yesterday. And along the way, lessen the suffering of others. You'd be surprised how far that gets you.
The source of which seems to be here.
It's hard to imagine two philosophies more suited to the mission of libraries and librarians in the world.