The Scriptures speak of the four spirits of the heavens — in Hebrew it is the four winds of the heavens — Jesus said the wind bloweth where it listeth — in Greek it reads, pneuma, spirit, goeth where it listeth. Ministering spirits are metaphorical terms for good and pure thoughts — evil spirits are the same terms for evil thoughts. John speaks of the spirit of Truth, whom the world cannot receive.
Again he writes, when the spirit of Truth is come it will guide you into all Truth; by this is meant that demonstration of the power of Truth depends upon understanding its letter, and possessing its spirit. We shall learn of divine Science the Truth of health. By this he meant, that we must possess the spirit of Truth, Christ, or we cannot have the power of Truth, Christ, wherewith to cast out error and heal the sick. Both the spirit and the letter are indispensable in Christian Science, and without them both, there can be no instantaneous healing. Mary Baker Eddy
(Carpenter, Gilbert, Fragments Gathered From Unpublished Items Ascribed to Mary Baker Eddy, p.28)