In Christian theology, traducianism is a doctrine about the origin of the soul or synonymously, spirit, holding that this immaterial aspect is transmitted through natural generation along with the body, the material aspect of human beings. That is, human propagation is of the whole being, both material and immaterial aspects: an individual's soul is derived from the soul of one or both parents. This implies that only the soul of Adam was created directly by God (with Eve's substance, material and immaterial, being taken from out of Adam), in contrast with the idea of creationism of the soul, which holds that all souls are created directly by God.