His family also had a history of intense self-criticism, to the point of depression and suicidal tendencies. Three of his four brothers committed suicide. Most of his romantic attachments were to young men. Though he had a doctorate in Mechanical Engineering, he did not invent anything.
He says: ‘My propositions are elucidatory in this way: he who understands me finally recognizes them as senseless’.
These commentators believe that the book is deeply ironic, and that it demonstrates the ultimate nonsensicality of any sentence attempting to say something metaphysical, something about those fixations of metaphysical philosophers, about those things that must be passed over in silence, and about logic.
He did develop a version of the Truth Table.