[A] thorough definition of empiricism is no simple task. In this article, we will instead attempt an overarching exposition of two overlapping but divergent paradigms of empiricism: (a) strict empiricism, representing most of the British empiricists and ancient skeptics and (b) mitigated, or metaphysical,1 empiricism represented by Aristotle and St. Thomas Aquinas. Sense experience is the unifying departure point for both, but while (b) says that human knowledge begins with sense experience, (a) tends to ultimately reduce knowledge to sense experience. (...) Concerning structure, our article is divided into two parts. The first consists of two sections: (1) a philosophical critique of strict empiricism from the viewpoint of mitigated empiricism and (2) an account of how both versions of empiricism view causality. The second part consists of a critique of strict empiricism from the point of view of mathematics and modern physics. Since the very scope of these topics has generated a vast literature, the sole aim of our thesis can be only to raise questions about certain empiricist presuppositions that enjoy wide appeal, especially in the English-speaking world. (shrink)