Romans 8:13 - Matthew Poole's English Annotations on the Holy Bible

If ye live after the flesh, ye shall die; viz. eternally, and never partake of the glorious resurrection before spoken of. The godly themselves need this caution; they must not think, that because they are elected and justified, &c., that therefore they may do and live as they list. Through the Spirit; i.e. by the grace and assistance of the Spirit. Mortify; i.e. kill and put to death. It is not enough to forbear the actings of sin, but we must kill and crucify it. Sin may be left upon many considerations, and yet not mortified. Evil deeds are called the deeds of the body, because the body is so instrumental in the doing thereof. There are some, that by body here do understand the corrupt nature, the same that before in many places he calls the flesh: this was called, Romans 8:6, the body of sin, and here it is called the body. Ye shall live; viz. eternally. See a parallel place, Romans 6:22 Galatians 6:8: see Romans 8:6.