The reason that fiction is more interesting than any other form of literature, to those who really like to study people, is that in fiction the author can really tell the truth without humiliating himself.
Even if there is only one possible unified theory, it is just a set of rules and equations. What is it that breathes fire into the equations and makes a universe for them to describe? The usual approach of science of constructing a mathematical model cannot answer the questions of why there should be a universe for the model to describe. Why does the universe go to all the bother of existing?
In normal life we hardly realize how much more we receive than we give, and life cannot be rich without such gratitude. It is so easy to overestimate the importance of our own achievements compared with what we owe to the help of others.
You cannot hope to build a better world without improving the individuals. To that end, each of us must work for our own improvement and, at the same time, share a genaral responsibility for all humanity, our particular duty being to aid those to whom we think can be most useful.
Take a factory, a railway, a ship on the high seas, said Engels: is it not clear that not one of these complex technical establishments, based on the use of machinery and the systematic co-operation of many people, could function without a certain amount of subordination and, consequently, without a certain amount of authority or power?