Therefore, some intelligent being exists by whom all natural things are directed to their end; and this being we call God. — St Thomas Aquinas, Summa Theologica: Article 3, Question 2) Aquinas notes that the existence of final causes, by which a cause is directed toward an effect, can only be explained by an appeal to intelligence.
Oleh karena itu, sesosok cerdas nyata karena benda-benda alam terarahkan untuk tujuannya; dan sosok ini kita sebut Tuhan. — St Thomas Aquinas, Summa Theologica: Article 3, Question 2), Summa Theologica: Article 3, Question 2) Aquinas mencatat bahwa keberadaan sebab akhir, yang mana sebab diarahkan menuju efek tertentu, hanya dapat dijelaskan oleh dorongan kepada kecerdasan.