Love this simple and insightful short reply Sri Sri Ravi Shankar gave to a question on enlightenment:
"Enlightenment is going from being somebody to becoming nobody. That is the first step. We walk around being somebody, I like this, I don't like this, I hate this, I love that. In the first step, strong feelings of hatred or strong feelings of craving get loosened up in you. You become like a child. The second step to enlightenment is from being nobody to being everybody. Go from being somebody to nobody to everybody. That is enlightenment."
Found in his book: "Wisdom For The New Millennium"
He also talks a lot about meditation, pranayama breathing etc. being the cornerstone for personal change very inline with the AYP writings.