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Without a brain, it is true, I probably should not have such experiences as we call "sound," "taste," '' light," '' heat," and the rest. But physical perception is only the lowest grade of conscious experience. Even that experience must have a percipient background. Whatever is brought forward from the physical side, it is met by a stronger fact on the mental side, in the shape of that which interprets it. There are no purely "physical" experiences without mental correspondencies; whereas there are many mental states which have no exact physical counterpart, such, for example, as our logical and mathematical processes of thought.

The sense of resistance is sometimes pointed out as purely physical, as the most fundamental evidence that the physical world exists. But all that we know about this experience is that force meets force. The materialist is unable to tell us what that force is. Moreover, resistance is not physical alone. Whose mental world is so poor that the soul has never encountered the resistance offered by fears, doubts, states of despondency and the like? What is more stubborn than one's own lower self? Again, the fact of motion is said to be primarily physical. But motion is not confined to the physical world; no moment of consciousness stands still. Consciousness is like a river where there is always a perceptible current.