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 olden times gold was manufactured by science; nowadays science must be renewed by gold. We have fixed the volatile and we must now volatilize the fixed—in other words, we have materialized spirit, and we must now spiritualize matter.
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.