When an ideal is envisioned one must work toward the fruition of that idea. An ideal is something that one creates as a building block of one's moral and ethical reality. When we work toward an ideal, we work toward the idea of something better, which indicates the power of the idea, the power of imagination and thought, the mind. What is the mind? Is the mind the brain? Is the mind the electrical impulses in the brain? Is the mind the individual electrons that make up the impulses? When you deconstruct anything, it becomes nothing.
An ideal can be good or bad. We all have the idea that we are something more then the physical being that we seem to be. We call it spirit or soul or atman or ghost. Most of us don't feel the need to define it. Is it real or as it a collective hallucination?
Then faith emerges to prop up the ideal. Without faith the ideal becomes unreachable, unrealistic, and there is no impetus to reach the ideal. Without faith in the ideal it becomes nothing. So faith arises out of the individual spirit, the jiva in Sanskrit, out of our "minds" and our "hearts". Without the faith that the ideal can and will be realized there is no reason to work toward the ideal. It's an example of quantum physics in that we create what we we see by seeing it, we destroy what we don't see by not looking. In any case, the more you take it apart to look at its parts the more it resembles nothing.
The ultimate ideal is God. God can be described as everything, or within everything, or as a separate being. It is ridiculous to describe God as anything less then everything, as a God apart from everything makes everything look ridiculously like nothing. If God is everything, our jivas are God, as well as everything else. It's simple but important.
Why work toward something good? Why not? Why move or breathe or walk or sing at all? The reason is that you want to become happy, that you want others to be happy. And to be happy you want to know God, and God is nothing less then love, and love is joy. Essentially all existence is joy. At the essence of our enlightenment experience is comapassion and the realization that we are not seperated, that we are all utterly connected, and this brings joy to us.