The process of creation or bringing into existence and annihilation or returning to non-existence, and recreation of similars is a dynamic existential movement. There is a principle of unity and a principle of diversity in creation. ""The multiplicity of existents that results is not in the one reality of existence, but in the manifold aspects of the recipients of existence in the various degrees, each according to its strength or weakness, perfection or imperfection, and priority or posteriority. Thus the multiplicity of existents does not impair the unity of existence, for each existent is a mode of existence and does not have a separate ontological status"". He clarifies that the Essence of God is absolutely transcendent and is unknown and unknowable, except to Himself, whereas the essence or reality of a thing consists of a mode of existence providing the permanent aspect of the thing, and its quiddity, endowing it with its changing qualities.