The critique of pure reason : with preface to the first edition, 1781

Immanuel Kant (1724-1804) is considered one of the giants of philosophy, of his age or any other. It is largely this book that provides the foundation of this assessment. Whether one loves Kant or hates him (philosophically, that is), one cannot really ignore him; even when one isnt directly dealing with Kantian ideas, chances are great that Kant is made an impact. Kant as a professor of philosophy was familiar with the Rationalists, such as Descartes, who founded the Enlightenment and in many ways started the phenomenon of modern philosophy. He was also familiar with the Empiricist school (John Locke and David Hume are perhaps the best known names in this), which challenged the rationalist framework. Between Leibniz monads and Humes development of Empiricism to its logical (and self-destructive) conclusion, coupled with the Romantic ideals typified by Rousseau, the philosophical edifice of the Enlightenment seemed about to topple. Kant rode to the rescue, so to speak. He developed an idea that was a synthesis of Empirical and Rationalist ideas. He developed the idea of a priori knowledge (that coming from pure reasoning) and a posterior knowledge (that coming from experience) and put them together into synthetic a priori statements as being possible. Knowledge, for Kant, comes from a synthesis of pure reason concepts and experience. Pure thought and sense experience were intertwined. However, there were definite limits to knowledge. Appearance/phenomenon was different from Reality/noumena - Kant held that the unknowable was the ding-an-sich, roughly translated as the thing-in-itself, for we can only know the appearance and categorial aspects of things. Kant was involved heavily in scientific method, including logic and mathematical methods, to try to describe the various aspects of his development. This is part of what makes Kant difficult