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Of course it is not by argument that we originally come by our belief in an independent external world. We find this belief ready in ourselves as soon as we begin to reflect: it is what may be called an instinctive belief. We should never have been led to question this belief but for the fact that, at any rate in the case of sight, it seems as if the sense-datum itself were instinctively believed to be the independent object, whereas argument shows that the object cannot be identical with the sense-datum

The first sentence of Russell's The Problems of Philosophy expresses his skeptical roots: "Is there any knowledge in the world which is so certain that no reasonable man could doubt it?" (Russell 7). His answer to the question is clearly no, and before we come to the end of the second page he claims that "anything. . . may be reasonably doubted" (Russell 8). He questions everything from the existence of the table to whether other minds exist. He asserts that reality is not what it appears and that "even the strangest hypothesis may not be true" (Russell 16). Regardless of this fact, Russell proceeds to explain which things