What fiction book was most influential/pivotal to your ideological development? Not your favorite or the most difficult book, but which one most changed how you viewed the world.
For me it's probably Cat's Cradle by Vonnegut. The formulation of religion/ideology as a way to make a necessary 'leap' to crystalize a sudden understanding of the world without even necessarily being true allowed me to make a large amount of progress in understanding how humans actually 'work'. It took me out of this arrogance that I had been wallowing in by making me realize that my supposedly neutral, objective view also had a framing and a context which I didn't build. It was consistent with itself but insulated me from the world by serving as the frame through which I viewed it. And all people have such a framing and can 'snap' from one to another when they have a crisis of faith. I also realized that it's almost impossible to exist without one, and that the closest you can come to objectivity is to just notice that the frame is there and accept it as a function of human psychology and a part of normal human limitations. One of my favorite quotes to this day is still from that novel:
Tiger got to hunt, bird got to fly
Man got to sit and wonder 'why, why, why?'
Tiger got to sleep, bird got to land
Man got to tell himself he understand.