Diogenes Allen, The Traces of God in a Frequently Hostile World (Cambridge, MA: Cowley, 1981), p. 35, quoted in Murphy, Nancey, "Postmodern Apologetics, Or Why Theologians Must Pay Attention to Science (pp. 105-20 of Religion and Science: History, Method, Dialogue, ed. by W. Mark Richardson and Wesley J. Wildman, New York: Routledge, 1996):

When God creates, it means that he allows something to exist which is not himself. This requires an act of profound renunciation. He chooses out of love to permit something else to exist, something created to be itself and to exist by virtue of its own interest and value."

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Other good secondary sources:
essays by Leon Kass; The Lion and the Ass (Sacks);
Certain People of the Book (Maurice Samuel), esp. ch. 5.