If "rationalism" refers to the thesis that there is a right way to do whatever it is that we do—a way that we, with our reason, can discover—then Ludwig Wittgenstein is a critic of rationalism. For our words and deeds are justified only by the rules of particular language-games—but these language-games are themselves justified only insofar as they meet our needs; certainly none of them need be justified by reference to any of the others. Together, our language-games constitute our form of life; though this form of life is not entirely arbitrary—some of its features can be explained by reference to our nature—nonetheless it could be different in many ways. Indeed, it has been—and therefore probably will be—different in many ways; on some level, we all know this. Philosophy at its worst is the attempt to forget it; philosophy at its best is, therefore, the attempt to remember it.