A quiddity only participating in esse

"our intellect can grasp only that which has a quiddity participating in 'to-be' [while] the quiddity of God is 'to-be itself'".

St. Thomas Aquinas, Commentary on the Book of causes, trans. Vincent Gualiardo, Charles Hess, & Richard Taylor (Washington, DC:  Catholic University of America Press, 1996), p. 51 (p. 47), p. 52 (p. 43), as quoted by David B. Burrell, C.S.C., in his "The act of creation with its theological consequences," in Creation and the God of Abraham, ed. David B. Burrell, Carlo Cogliatti, Janet M. Soskice, & William R. Stoeger (Cambridge:  Cambridge University Press, 2010), 49 (40-52).