This revised edition of Sir Anthony Kenny's classic work on Wittgenstein contains a new introduction which covers developments in Wittgenstein scholarship since the book was first published. Widely praised for providing a lucid and historically informed account of Wittgenstein's core philosophical concerns. Demonstrates the continuity between Wittgenstein's early and later writings. Provides a persuasive argument for the unity of Wittgenstein's thought. Kenny also assesses Wittgenstein's influence in the latter part of the twentieth century.