Imagine that you are an astronomer on a world with one moon. It is always night on your world, and the moon is the only body in the sky.
Every grain of sand is a link in an essential causal chain.
St. Thomas laid the intellectual groundwork for modern natural science — the absolute distinction between existence and essence.
Nature is like a stack of books, sessile, until moved.
In my ongoing debate with biologist Jerry Coyne, frequent reference is made to Aquinas’ Five Ways, particularly to his Prime Mover argument.