Manichaean theology was dualistic. A key belief in Manichaeism is that there is no omnipotent good power. This addresses a theoretical part of the problem of evil by denying the infinite perfection of God and postulating two equal and opposite powers. The human person is seen as a battleground for these powers: the good part is the soul, which is composed of light, and the bad part is the body, composed of dark earth. The soul defines the person and is incorruptible, but it is under the domination of a foreign power, which addressed the practical part of the problem of evil. Humans are said to be able to be saved from this power (matter) if they come to know who they are and identify themselves with their soul.