In the preface to the book he says that its value consists in two things: "that thoughts are expressed in it" and "that it shows how little is achieved when these problems are solved." The problems he refers to are the problems of philosophy defined, we may suppose, by the work of Frege and Russell, and perhaps also Schopenhauer.

During World War II he worked as a hospital porter in London and as a research technician in Newcastle.

After the war he returned to university teaching but resigned his professorship in 1947 to concentrate on writing.

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.

Ludwig Josef Johann Wittgenstein, born on April 26th 1889 in Vienna, Austria, was a charismatic enigma.

This work culminated in the , 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.

Much of this he did in Ireland, preferring isolated rural places for his work.

By 1949 he had written all the material that was published after his death as , arguably his most important work.

The seventh set contains only one proposition, the famous "What we cannot speak about we must pass over in silence." Some important and representative propositions from the book are these: 1 The world is all that is the case. 5.43 ..the propositions of logic say the same thing, to wit nothing.