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Do not localize your attention Not to localize or partialize the mind is the end of spiritual training. When it is nowhere it is everywhere. When it occupies one tenth, it is absent in the other nine tenths. Let the gung fu man discipline himself to have the mind go on its own way, instead of trying deliberately to confine it somewhere. Therefore, during chi sao, you should have nothing purposely designed, nothing consciously calculated, no anticipation, no expectation. In short, you should be standing there like a dead man. To be conscious is characteristic of the human mind as distinguished from the mind of the lower animals. But when the mind becomes conscious of its doings, it ceases to be instinctual and its commands are colored with calculations and deliberations—which means that the connection between itself and the limbs is no longer direct because the identity of the commander and his executive agent is lost. When dualism (yang against yang) takes place, the whole personality never comes out as it is in itself (letting go itself from itself).
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Bruce Lee (Bruce Lee The Tao of Gung Fu: Commentaries on the Chinese Martial Arts)