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Man is of three parts: spirit, soul, and body (1 Thes. 5:23andnote 1 Thes. 5:235c). The soul is the organ that mediates between the body and the spirit; it possesses self-consciousness, that man may have his personality. It is contained in the body and is the vessel to contain the spirit. As to the believer, God as the Spirit dwells in his regenerated spirit (Rom. 8:9,16) and spreads from his spirit to saturate his soul that it may be transformed to express Him (Rom. 12:2;2 Cor. 3:18). This is the prosperity of the believer's soul. When our soul is occupied and directed by the Spirit of God through our spirit so that it directs and uses our body for God's purposes, it prospers. The apostle wished that the recipient, who was a beloved brother, outstanding in such a prosperity of his soul, might prosper in all things and in bodily health, just as his soul prospered in the divine life.