Thousands of years before the development of psychology, the Raja yogis of India, dealt human mental abilities, and pondered the same questions that today's modern scientists are asking. Much of what science is just discovering now, clearly validate Eastern philosophy, especially the Raja Yoga Philosophy. This book was originally published early in the 20th Century, and marked a turning point in Western thought. If you have a need to understand the human psyche, spirituality, and want an effective self help source to improve and develop all aspects of your life.