Raja Yoga is sometimes called the yoga of meditation. It is the soul of all the other yogas. The emphasis here is on controlling the mind through concentration and meditation. Raja yoa is also called the psychological way to union with God.
The Yoga Aphorisms of Patanjali is a major work on the practice of yoga and meditation. Through these aphorisms you will learn how to control your mind and achieve inner peace and freedom. Although these methods were taught over 2000 years ago, they are as alive and effective today as they have ever been.