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 NeeTo walk after the spirit a believer must inhibit his mind from revolving endlessly. If it turns too long around one topic, worries or grieves too much over matters, and ponders too intensively to know God's will, it may become unbearable and hamper its normal operation. The mind needs to be kept in a steady and secure state.
Watchman NeeFrequently what we say is rest is merely laziness. Our body requires respite and so does our mind and spirit. But a person should never rest because of a laziness which arises from the evil nature in his emotion. How often laziness and emotional distaste for work join to employ physical fatigue as a cover-up.
Watchman Nee