Vending machines, because each is just a word telling you that both were empty. Vending machines is what the whole sentence is based on.
St. Thomas Aquinas is very famous for his theological studies. In them, he analyzed the connection between faith and reason and provided logical and philosophical evidence of God's existence. He explains that nothing odd is there in having faith, and that it is justified, as it is all true. He does distinguish both, but also says that they work together to explain how the world works.