The Lord's wilderness conflict throws light upon this, for it appears that it was not until after Satan had left Him, and the tension of the conflict was over, that His physical needs asserted themselves, and "He hungered." ( Mt. 4:2; top ) True "fasting," therefore, appears to be not so much the result of a believer's choice and determination to fast from food, as the result of some spirit-burden, or conflict, which constrains him to fast because of the dominance of the spirit over his body, and no sense of physical need at all. But when the conflict is over and the spirit disengaged, the requirements of the body make themselves felt once more.
There is also a permanent attitude toward the body, which may be described under the word "fasting," which is a necessary condition for continuous victory over evil spirits. Especially for the casting out of evil spirits, it is imperative that the believer has complete mastery over his body, able to discriminate between its legitimate demands, and the spirits of evil seeking to gain a footing behind its lawful needs, and to detect all the wiles seeking to rob him of victory over them.
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