"Judaism emphatically rejects any concept of plurality with respect to God", explicitly rejecting polytheism, dualism, and trinitarianism, which are "incompatible with monotheism as Judaism understands it". The unity of God is stated many times in Jewish tradition. It is the second of Maimonides's 13 principles of faith; Maimonides wrote that, "This God is One, not two or more than two, but One whose unity is different from all other unities that there are. He is not one as a genus, which contains many species, is one. Nor is He one as a body, containing parts and dimensions, is one. But His is a unity that which there is no other anywhere" ("Yad", "Yesode Ha-Torah" 1:7).