Ludwig Wittgenstein is one of the most influential philosophers of the twentieth century, and regarded by some as the most important since Immanuel Kant. His early work was influenced by that of Arthur Schopenhauer and, especially, by his teacher Bertrand Russell and by Gottlob Frege, who became something of a friend. This work culminated in the Tractatus Logico-Philosophicus, the only philosophy book that Wittgenstein published during his lifetime. It claimed to solve all the major problems of philosophy and was held in especially high esteem by the anti-metaphysical logical positivists. The Tractatus is based on the idea that philosophical problems arise from misunderstandings of the logic of language, and it tries to show what this logic is.
Wittgenstein’s later work, principally his Philosophical Investigations, shares this concern with logic and language, but takes a different, less technical, approach to philosophical problems. This book helped to inspire so-called ordinary language philosophy. This style of doing philosophy has fallen somewhat out of favor, but Wittgenstein’s work on rule-following and private language is still considered important, and his later philosophy is influential in a growing number of fields outside philosophy.
On religion and ethics:
Wittgenstein had a lifelong interest in religion and claimed to see every problem from a religious point of view, but never committed himself to any formal religion. His various remarks on ethics also suggest a particular point of view, and Wittgenstein often spoke of ethics and religion together. This point of view or attitude can be seen in the four main themes that run through Wittgenstein’s writings on ethics and religion: goodness, value or meaning are not to be found in the world; living the right way involves acceptance of or agreement with the world, or life, or God’s will, or fate; one who lives this way will see the world as a miracle; there is no answer to the problem of life–the solution is the disappearance of the problem.