In ancient times, the Indian rishi Patanjali highlighted the principal stages of the ascent to spiritual heights, to the Primordial Consciousness. He distinguished eight major steps of this yama - niyama - asana - pranayama - pratyahara - dharana - dhyana - samadhi. This book describes the eight steps of Patanjali's yoga.
Wonderfully clear translation, easy to understand. Outlines the program of yogic spiritual growth from beginning to end. A book you must have been a library.