The learned and philosophical have found in these three words a magnificent field for the display of philosophy and learning; but unhappily for plain people, it is not very easy to follow them. As the words stand before us in the text, they have a friendly Biblical look; we get a fair impression of the Apostle's intention in using them; but as they come out in treatises on Biblical Psychology, though they are much more imposing, it would be rash to say they are more strictly scientific, and they are certainly much less apprehensible than they are here. To begin with the easiest one, everybody knows what is meant by the body. What the Apostle prays for in this place is that God would make the body in its entirety--every organ and every function of it--holy. God made the body at the beginning; He made it for Himself; and it is His. To begin with, it is neither holy nor unholy; it has no character of its own at all; but it may be profaned or it may be sanctified; it may be made the servant of God or the servant of sin, consecrated or prostituted. Everybody knows whether his body is being sanctified or not. Everybody knows "the inconceivable evil of sensuality." Everybody knows that pampering of the body, excess in eating and drinking, sloth and dirt, are incompatible with bodily sanctification. It is not a survival of Judaism when the Epistle to the Hebrews tells us to draw near to God "in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water." But sanctification, even of the body, really comes only by employment in God's service; charity, the service of others for Jesus' sake, is that which makes the body truly His. Holy are the feet which move incessantly on His errands; holy are the hands which, like His, are continually doing good; holy are the lips which plead His cause or speak comfort in His Name. The Apostle himself points the moral of this prayer for the consecration of the body when he says to the Romans, "Present your members as servants to righteousness unto sanctification."
But let us look, now, at the other two terms--spirit and soul. Sometimes one of these is used in contrast with body, sometimes the other. Thus Paul says that the unmarried Christian woman cares for the things of the Lord, seeking only how she may be holy in body and in spirit,--the two together constituting the whole person. Jesus, again, warns His disciples not to fear man, but to fear Him who can destroy both soul and body in hell; where the person is made to consist, not of body and spirit, but of body and soul. These passages certainly lead us to think that soul and spirit must be very near akin to each other; and that impression is strengthened when we remember such a passage as is found in Mary's song: "My soul doth magnify the Lord, and my spirit hath rejoiced in God my Saviour"; where, according to the laws of Hebrew poetry, soul and spirit must mean practically the same thing. But granting that they do so, when we find two words used for the same thing, the natural inference is that they give us each a different look at it. One of them shows it in one aspect; the other in another. Can we apply that distinction here? I think the use of the words in the Bible enables us to do it quite decidedly; but it is unnecessary to go into the details. The soul means the life which is in man, taken simply as it is, with all its powers; the spirit means that very same life, taken in its relation to God. This relation may be of various kinds: for the life that is in us is derived from God; it is akin to the life of God Himself; it is created with a view to fellowship with God; in the Christian it is actually redeemed and admitted to that fellowship; and in all those aspects it is spiritual life. But we may look at it without thinking of God at all; and then, in Bible language, we are looking, not at man's spirit, but at his soul.