We don't exhaust the Bible even after reading it hundreds of times. Each time we read it we see it in a new light. That is the greatness of the holy scriptures. They are that way because they were created by holy prophets who experienced the truth. Each time we read these works we elevate ourselves to see a little more.
Integral Yoga: The Yoga Sutras of Patanjali (ed. Integral Yoga Dist, 1984)