For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live.
Those who live according to the flesh must die, not only physically but eternally. To live according to the flesh is to be unsaved. In the rest of the verse, Paul described what is characteristically true of genuine believers. By the enablement of the Holy Spirit, they put to death the deeds of the body. They enjoy eternal life now, and will enter into it, in its fullness when they leave this earth.