Yoga is an interior penetration leading to integration of being, senses, breath, mind, intelligence, consciousness, and Self. It is definitely an inward journey, evolution through involution, toward the Soul, which in turn desires to emerge and embrace you in its glory.
The material body has a practical reality that is accessible. It is here and now, and we can do something with it. However, we must not forget that the innermost part of our being is also trying to help us. It wants to come out to the surface and express itself.
