One of Eckhart's most famous concepts is the idea of "the God-Head," which refers to the unity of God and the soul. He believed that the soul was not separate from God, but rather was a part of God, and that the ultimate goal of human life was to realize this unity. Eckhart's teachings on the God-Head were considered radical and even heretical by some of his contemporaries, and he was eventually accused of heresy by the Catholic church.