Maimonides - Définir Dieu par ce qu'il n'est pas (Wikipedia)

Maimonides was led by his admiration for the neo-Platonic commentators to maintain many doctrines which the Scholastics could not accept. For instance, Maimonides was an adherent of "negative theology" (also known as "Apophatic theology".) In this theology, one attempts to describe God through negative attributes. For instance, one should not say that God exists in the usual sense of the term; all we can safely say is that God is not non-existent. We should not say that "God is wise"; but we can say that "God is not ignorant", i.e. in some way, God has some properties of knowledge. We should not say that "God is One", but we can state that "there is no multiplicity in God's being". In brief, the attempt is to gain and express knowledge of God by describing what God is not; rather than by describing what God "is".