Basil of Caesarea

"Let the earth bring forth living creatures according to their kinds: cattle and creeping things and beasts of the earth according to their kinds." Consider the word of God moving through all creation, having begun at that time, active up to the present and efficacious until the end, even to the consummation of the world. As a ball, when pushed by someone and then meeting with a slope, is borne downward by its own shape and the inclination of the ground and does not stop before some level surface receives it, so too the nature of existing objects, set in motion by one command, passes through creation, without change, by generation and destruction, preserving the succession of the species through resemblance, until it reaches the very end.