The instructions for yoga in the Indian Vedas and Upanishads, especially in the Bhagavad Gītā, the sublime dialogue between the master of heaven and the son of earth, offer the highest and deepest wisdom ever taught on earth. This teaching has also been spreading recently in the Western World, but it is not new. Franz Hartmann, the greatest German mystic of the 19th century, argues that what has been taught in the Bhagavad Gītā, which we have known for 600 years in Christianity, has been taught especially emphatically and convincingly by the great mystic of the 13th century, Meister Eckhart. Hartmann proves that the path to the realization of "Christ in us" and the yoga teachings in the Bhagavad Gītā is almost identical. Contrasting these two proves many congruent points in Eckhart's writings.