§7. Whereof one cannot speak, thereof one must be silent.Ludwig Wittgenstein is such a contradictory figure that there are, in professional philosophical usage, two of him. Wittgenstein I had solved every philosophical problem in his Tractatus Logico-Philosophicus (1921); having nothing else to do, he went home to Austria and became, unsuccessfully, a schoolteacher. In 1929, Wittgenstein I returned to Cambridge, where he began his transformation into Wittgenstein II. He was no longer confident in the Tractatus, his certainty in any answers less firm. Wittgenstein II's great, posthumous, work was the Philosophical Investigations. But Wittgenstein the living man was one, not two: musician and architect, reader of mysteries and engineer. "If philosophy has anything to do with wisdom," he once wrote, "there's certainly not a grain of that in Mind, and quite often a grain in the detective stories."
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