In an interesting book that I may have previewed here at some time in the past, Lex Hixon traces enlightenment in ten different traditions. My interpretation of the message is that we need to move beyond the concept of a supreme being to one of a supreme identity. This means that we must develop to the point where we drop the ego.
While enlightenment is often presented in tandem with mysticism, it can be discussed in practical terms. It is more important than ever that anyone who is in a position to do so research enlightenment and get the message out to those who they can influence. Remarkably enough, there are theologians who have never reached the enlightenment stage. (I recently previewed a book, Darwin's Gift, by Francisco Ayala that makes the case that evolution explains why "God" did nasty things. Wow!)
The concept of supreme identity is consistent not only with the advanced levels of religious traditions but also with physics, biology, psychology -- just about anything you can name. One doesn't have to be a mystic to know this. A few moments of reflection is all that is required.
My research has led me to the conclusion that we must have living systems that encourage individuals to develop a supreme identity. In simple and practical terms, we're all in this together. A sustainable system would not permit accumulation beyond what is necessary to get us through a winter or two. Buying a 2500 s.f. house and working for 30 years or more to pay for it is not sustainable. If we die with material assets, then we have failed the supreme identity test and the sustainability test.