" Kant was surely right that our minds "cleave the air" with concepts of substance, space, time, and causality. They are the substrate of our conscious experience. They are the semantic contents of the major elements of syntax: non, preposition, tense, verb. They give us the vocabulary, verbal and mental, with which we reason about the physical and social world. Because they are gadgets in the brain rather than readouts of reality, they present us with paradoxes when we push them to the frontiers of science, philosophy, and law. And as we shall see in the next chapter, they are a source of the metaphors by which we comprehend many other spheres of life. "

― Steven Pinker , The Stuff of Thought: Language as a Window into Human Nature