Quote

"Now in the Christian universe nothing ever happens save in the name of a rational order, nothing exists save as depending on it. In everyday conversation we may be permitted to speak of chance, but since the world is God's work and nothing it contains is withdrawn from His providence, it is impossible to regard anything as absolutely fortuitous. Nihil igitur casu fit in mundo; nothing happens by chance: that is the ultimate Christian attitude to the universal order."

-Etienne Gilson in "The Middle Ages and Nature" on how the Medieval conception of nature affirmed more determinism than the classical conception of nature did.