" It is possible to demonstrate God’s existence, although not a priori, yet a posteriori from some work of His more surely known to us. "
- Thomas Aquinas

In essence, Thomas Aquinas argues that proof of God's existence can be found through empirical observation rather than pure reason alone. He suggests that while we cannot know God’s existence with absolute certainty from a purely logical standpoint, there are observable phenomena and works in the world around us that offer convincing evidence for His presence.

Aquinas delves deeper into the idea that understanding God's existence involves examining the natural order of things and recognizing patterns or complexities beyond human comprehension. He believes that certain aspects of nature and the universe exhibit such intricacy and perfection that they point to a divine creator. By analyzing these phenomena, one can build a logical argument for the existence of God based on empirical evidence found in creation itself rather than relying solely on abstract philosophical reasoning.

Thomas Aquinas was a prominent medieval philosopher and theologian whose work significantly influenced Western Christianity and philosophy. Born in 1225 to an aristocratic family in Italy, he became a Dominican friar early in life. His contributions to theology include the famous "Five Ways" argument for God's existence, which is closely related to the quote provided. Through his extensive writings on faith and reason, Aquinas aimed to reconcile religious doctrine with rational inquiry, thereby laying foundational stones for future discussions about the relationship between science and religion.