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Satan can only attack us from the outside in. He may work through the lust and sensations of the body or through the mind and emotion of the soul, for those two belong to the outward man.

Watchman Nee (1993). “The Finest of the Wheat, vol 2 - Hardcover: Selected Excerpts from the Published Works of Watchman Nee”, p.69, Christian Fellowship Publishers
Satan can only attack us from the outside in. He may work through the lust and sensations of the body or through the mind and emotion of the soul, for those two belong to the outward man.