  Santayana (like Hume, Wittgenstein, and Strawson) holds there are certain inevitable beliefs; they are inescapable given nature and our individual physical history. And like Wittgenstein, he maintains that these beliefs are various and variable. They are determined by the interplay between environment and psyche, i.e., between our natural conditions and the inherited, physical “organisation of the animal” (the psyche). That we now inescapably believe in external objects and the general reliability of inductive reasoning, for example, is a result of physical history and the natural conditions of our world and ourselves. Since these beliefs are relative to our physical histories, if our history and biological order had been different, our natural beliefs would also be different.