This makes all the difference. Scripture never contemplates such a thing as a Christian groaning under sin, guilt, doubt, or fear; or sighing after the riches, honors or pleasures of this vain, sin-stricken world. Alas, alas, they do thus groan through ignorance of their true position in a risen Christ and their proper portion in the heavens! But such is not the ground or character of the groan in the scripture now before us; Paul saw with distinctness his house in the heavens; and, on the other hand, he felt the heavy burden of the tabernacle of clay; and he ardently longed to lay aside the latter and be clothed with the former.
Hence, then, there is the fullest harmony between "_we know_" and "_we groan_." If we did not know for a certainty that we have a building of God, we should like to hold our earthly house as long as possible. We see this constantly. Men cling to life. They leave nothing untried to keep body and soul together. They have no certainty as to heaven. They cannot say, "we _know_" that "we _have_" anything there. On the other hand, they have a terrible dread of the future, which to their vision is wrapped up in clouds and thick darkness. They have never committed themselves in calm confidence to God and His word; they have never felt the tranquilizing power of His love. They have viewed Him as an angry Judge instead of seeing Him as the sinner's Friend--a just God and a Saviour--the righteous Justifier. No marvel, therefore, if they shrink with terror from the thought of meeting Him.
But it is a totally different thing with a man who knows God as his Father--his Saviour--his best Friend; who knows that Jesus died to save him from his sins, and from all the consequences thereof. Such an one can say:
"I have a home above, From sin and sorrow free; A mansion which eternal Love Designed and formed for me.
"The Father's gracious hand Has built this blest abode; From everlasting it was planned, The dwelling-place of God.
"The Saviour's precious blood Has made my title sure; He passed through death's dark, raging flood, To make my rest secure."
These are the breathings of simple faith, and they perfectly harmonize with the groans of a spirit "that looks beyond its cage and longs to flee away." The believer finds his body of sin and death a heavy burden, and longs to be free from the encumbrance, and to be clothed upon with a body suited to his new and eternal state--a new creation body--a body perfectly free from every trace of mortality. This cannot be until the morning of resurrection, that glorious moment, long looked for, when the dead in Christ shall rise and the living saints be changed, in a moment; when death shall be swallowed up in victory, and mortality shall be swallowed up of life.
It is for this we groan, not that we would be unclothed, but clothed upon. The unclothed state is not _the_ object, though we know that to be absent from the body is to be present with the Lord; and to depart and be with Christ is far better. The Lord Jesus is waiting that glorious consummation, and we wait in sympathy with Him. Meanwhile, "the whole creation groaneth and travaileth in pain together until now. And not only so, but ourselves also, which have the firstfruits of the Spirit, even we ourselves groan within ourselves, waiting for the adoption, to wit, the redemption of our body. For we are saved in hope: but hope that is seen is not hope: for what a man seeth, why doth he yet hope for? But if we hope for that we see not, then do we with patience wait for it" (Rom. viii. 22-25).