Evolution quotes

This is a table of quotes on what causes evolution, particularly whether a supernatural cause like God is invoked or denied.

Writer	Range of causes	Quotation	Source
Ernst Mayr	material, no supernatural	“Darwinism rejects all supernatural phenomena and causations. The theory of evolution by natural selection explains the adaptedness and diversity of the world solely materialistically.”	(“Darwin’s Influence on Modern Thought” E. Mayr [evolutionary biologist and zoologist], Scientific American, pg. 82-83, (July 2000), emphasis added)
Richard E. Dickerson	physical and material, no supernatural	"Science, fundamentally, is a game. It is a game with one overriding and defining rule. Rule No. 1: Let us see how far and to what extent we can explain the behavior of the universe in terms of purely physical and material causes, without invoking the supernatural."	(Richard E. Dickerson [evolutionist scientist]: "The Game of Science." Perspectives on Science and Faith, (Volume 44, June 1992), p. 137, emphasis added) [1]
Francisco Ayala	natural, no Creator or other external agent	It was Darwin’s greatest accomplishment to show that the directive organization of living beings can be explained as the result of a natural process, natural selection, without any need to resort to a Creator or other external agent...[Darwin’s] mechanism, natural selection, excluded God as the explanation...	Francisco Ayala [evolutionist scientist], “Darwin’s Revolution,” in Creative Evolution?!, eds. J. Campbell and J. Schopf (Boston, Mass.: Jones and Bartlett Publishers, 1994), pp. 4–5, emphasis added [2]