Modern philosophy
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Modern philosophy is philosophy done during the "modern" era of Europe and North America. It is not a specific doctrine or school, (and so should not be confused with Modernism) although there are certain assumptions common to much of it, which helps to distinguish it from earlier (and later?) philosophy.
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The modern period runs roughly from the beginning of the seventeenth century until the present. How much if any of the Renaissance it should include is a matter for dispute; likewise modernity may or may not have ended in the twentieth century and been replaced by post-modernity. How one decides these questions will determine the scope of one's use of "modern philosophy"; the convention, however, is to refer to philosophy of the Renaissance prior to Descartes as "Early Modern Philosophy" (leaving open whether that puts it just inside or just outside the boundary) and to refer to twentieth-century philosophy, or sometimes just philosophy since Wittgenstein, as "Contemporary Philosophy" (again, leaving open whether or not it is still modern). This article will focus on the history of philosophy from Descartes through the early twentieth century.
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[edit] History of modern philosophy
The major figures in philosophy of mind, epistemology, and metaphysics during the seventeenth and eighteenth centuries are roughly divided into two main groups. The "Rationalists," mostly in France and Germany, assumed that all knowledge must begin from certain "innate ideas" in the mind. Major Rationalists were Descartes, Spinoza, Leibniz, and Nicolas Malebranche. The "Empiricists," by contrast, held that knowledge must begin with sensory experience. Major figures in this line of thought are Locke, Berkeley, and Hume. (These are retrospective categories, for which Kant is largely responsible; but they are not too inaccurate).
Ethics and political philosophy are usually not subsumed under these categories, though all these philosophers worked in ethics. In their own distinctive styles. Other important figures here are Hobbes and Rousseau.
In the late eighteenth century Immanuel Kant set forth a groundbreaking philosophical system which claimed to bring unity to rationalism and empiricism. Whether or not he was right, he did not entirely succeed in ending philosophical dispute. Kant sparked a storm of philosophical work in Germany in the early nineteenth century. This was German Idealism; its characteristic theme was that the world and the mind equally must be understood according to the same categories; it culminated in the work of Hegel, who among many other things said that "The real is rational; the rational is real."
Hegel's work was carried in many directions by his students; most notably, Karl Marx appropriated both Hegel's philosophy of history and the empirical ethics dominant in Britain, transforming Hegel's ideas into a strictly materialist form, to be used as a tool for revolution. At the opposite end of the spectrum, Kierkegaard turned philosophy into an internal and religious endeavour. Schopenhauer took Idealism to the conclusion that the world was nothing but the futile endless interplay of images and desires, and advocated atheism and pessimism. Kierkegaard's and Schopenhauer's ideas were taken up and transformed by Nietzsche, who seized upon their various dismissals of the world to proclaim "God is dead" and to reject all systematic philosophy and all striving for a fixed truth transcending the individual. Nietzsche, though, found in this not a grounds for pessimism, but the possibility of a new kind of freedom.
(Rationalism is sometimes extended to include Rousseau, Kant and post-Kantian Idealism, and Empiricism is sometimes extended back to cover Hobbes and forward to cover John Stuart Mill and the Utilitarians, and is sometimes even treated as continuous with twentieth-century Analytic philosophy.)
During the nineteenth century British philosophy came increasingly to be dominated by strands of neo-Hegelist thought; it was exasperation with these that led Russell and Moore in the direction that became analytic philosophy.
Discussions of these movements follow in more detail.
[edit] Rationalism
Modern Philosophy traditionally begins with Rene Descartes and his dictum "I think, therefore I am." In the early seventeenth century the bulk of philosophy was dominated by Scholasticism: written by theologians and drawing upon Plato, Aristotle, and early Church writings. Descartes argued that many predominant Scholastic metaphysical doctrines were meaningless or false. In short, he proposed to begin philosophy from scratch. In his most important work, Meditations on First Philosophy, he attempts just this, over six brief essays. He tries to set aside as much as he possibly can of all his beliefs, to determine what if anything he knows for certain. He finds that he can doubt nearly everything: the reality of physical objects, God, his memories, history, science, even math, but he cannot doubt that he is, in fact, doubting. He knows what he is thinking about, even if it is not true, and he knows that he is there thinking about it. From this basis he builds his knowledge back up again. He finds that some of the ideas he has could not have originated from him alone, but only from God; he proves that God exists. He then demonstrates that God would not allow him to be systematically deceived about everything; in essence, he vindicates ordinary methods of science and reasoning, as fallible but not false.
