This collection of lectures, first published in 1964, introduces the traditional methods used in the spiritual science of Adhyatma Yoga, the Yoga of Self-Knowledge. They were given at Shanti Sadan, centre of Adhyatma Yoga, by the late Warden Marjorie Waterhouse, a close pupil of the founder, Dr Hari Prasad Shastri.Marjorie Waterhouse had a fully enlightened understanding of the spiritual path and its goal, and a gift for presenting the highest teachings in an approachable way. Meditation and related practices are now well-known, but their true significance and purpose is not easy to fathom. Marjorie Waterhouse is a specially insightful guide into how they may help us realize the infinite potentials of the human heart.