Everything you need to understand or teach 3001 by Arthur C. Clarke.
A basic premise of Clarke's science fiction is that the universe produces life.
For better or for worse, life develops and evolves. Rudimentary life forms evolve into sentient beings. Sentient beings develop technologies which enable them to either destroy themselves or, eventually, to grow beyond the need for material bodies and into some form of higher consciousness which becomes one with the essence of the universe. Aspects of this premise are implied or...