“John D. Barrow, Between Inner and Outer Space: Essays on Science, Art and Philosophy (Oxford University Press, 2000, , Part 4, ch. 13: Why is the Universe Mathematical? (p. 88). Also found in Barrow's "The Mathematical Universe" (1989) and The Artful Universe Expanded (Oxford University Press, 2005, , ch. 5, Player Piano: Hearing by Numbers, p. 250”

Source: Wikiquote