enlightenment is a state where you live in your vertical self unphased and unconcerned by the horizontal world. You fully give yourself over to Life, to Growth, to living through your higher self.
The first step to enlightenment is finding your Observer (also called Watcher) and stand in that position. Looking from there, your thoughts, your feelings, your emotions can be observed without getting entangled with them, identifying with them. You can hear and feel everything, but you are not part of it.
The third phase of enlightenment is to live true to your values, your principles, true to your true self.
This is the dominion of true happiness... and it's attainable to anyone, with practice and lots of paradigm shifts.