This study attempts a reconstruction of the philosophy of the unfinished Opus Tripartitum of Meister Eckhart. A feature of the volume is the hermeneutic approach to the question of Eckhart’s philosophy, another is the recognition that the concept of unity plays a decisive role in the organization of his metaphysics, to the extent, indeed, that one can speak of a metaphysics of the One . Eckhart’s metaphysics is determined to a contemplation of the divine, which in this thinking of unity is understood as the principle and end of all things. Through a systematic reading of linked texts the trail of Eckhart’s philosophy of the One is followed down into the German sermons.