Book excerpt: One of the earliest commentaries on the popular and highly respected yoga scripture known as the Bhagavad Gita. Roy Eugene Davis explains the inner meaning in the light of Kriya Yoga in this new commentary on this scripture. Its seven hundred verses encourage the reader to acquire Self-knowledge and to intentionally engage in constructive performance of personal duties along with dedicated spiritual endeavor--to practice Kriya Yoga. The Sanskrit word kriya means action. Yoga can mean to yoke or unite soul awareness with God; practice of procedures for this purpose; or samadhi, the realization of spiritual wholeness, the culmination of successful practice.