Extra-philosophical influences were very important in shaping Wittgenstein's philosophical ruminations. The Tractatus-Logico Philosophicus is misunderstood unless it is seen as deriving from the pre-Machian physics of the German tradition, adapted to the problems Russell confronted Wittgenstein with. In like manner, particularly in relation to the discussions of meanings and rules, the philosophy of the Philosophical Investigations is shaped by the role played by a powerful religious sensibility in Wittgenstein's extraordinary and tormented life.