Romans 6:13 - Matthew Poole's English Annotations on the Holy Bible

He fitly compares our bodily members to tools that artificers work, or weapons that soldiers fight withal; for as those, so these, may be used well or ill: e.g. With the hand one man giveth an alms, another stealeth; with the tongue one man blesseth, another curseth. By members here we are not only to understand the parts of the body, as the hands, eyes, ears, &c.; but also the faculties of the soul, as the understanding, will, affections, &c. These bear some proportion to the bodily members, as the understanding to the eye, &c. All of them must be employed by us as weapons to fight, not under the command of Satan for sin, but under the command of God for righteousness. As those that are alive from the dead: these words contain a reason why we should not serve sin and Satan, but bequeath and dedicate ourselves to the service of God, because we are endued with a spiritual life, after a spiritual death; or because we have received so great a benefit as to be raised in Christ from the death and power of sin.