Charles Spurgeon Commentary Romans 8:9-10

"But ye are not in the flesh but in the Spirit, if so be that the Spirit of God dwelleth in you. But if any man hath not the Spirit of Christ, he is none of his. And if Christ is in you, the body is dead because of sin; but the spirit is life because of righteousness." — Romans 8:9-10 (ASV)

But you are not in the flesh, but in the Spirit, if so be that the Spirit of God dwells in you. Now if anyone does not have the Spirit of Christ, he is none of his. And if Christ is in you, the body is dead because of sin; but the Spirit is life because of righteousness.

That is why we have aches and pains, and infirmities: because the body is dead. This means it is doomed to die and must die; it must see corruption unless the Lord comes, and even in that case, it must undergo a wondrous change. So, we regard our body as dead. No wonder, then, that all those aches and pains and bodily troubles do come upon us. The day shall come, however, when even it shall be delivered from the power of death. Meanwhile, blessed be God, the Spirit is life because of righteousness.

Now if any man have not the Spirit of Christ, he is none of his.

And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness.

The regeneration of the body, so to speak, is not performed in this life; Resurrection is tantamount to that. The body is still under the old law of death, and so we have pain and weakness, and we die; but the spirit, oh! how it triumphs, even in the midst of pain and weakness. The Spirit is life, because of righteousness. That will not die.