Romans 6:13

The body then is indifferent between vice and virtue, as also instruments (or arms) are. But either effect is wrought by him that useth it. As if a soldier fighting in his country's behalf, and a robber who was arming against the inhabitants, had the same weapons for defence. For the fault is not laid to the suit of armor, but to those that use it to an ill end. And this one may say of the flesh too which becomes this or that owing to the mind's decision, not owing to its own nature. For if it be curious after the beauty of another, the eye becomes an instrument of iniquity, not through any agency of its own (for what is of the eye, is but seeing, not seeing amiss), but through the fault of the thought which commands it. But if you bridle it, it becomes an instrument of righteousness. Thus with the tongue, thus with the hands, thus with all the other members. And he well calls sin unrighteousness. For by sinning a man deals unrighteously either by himself or by his neighbor, or rather by himself more than by his neighbor. Having then led us away from wickedness, he leads us to virtue, in these words: "But yield yourselves unto God, as those that are alive from the dead." See how by his bare words he exhorts them, on that side naming "sin" and on this "God." For by showing what a difference there is between the rulers, he casts out of all excuse the soldier that leaveth God, and desireth to serve under the dominion of sin. But it is not only in this way, but also by the sequel, that he establishes this; by saying, "as alive from the dead." For by these he shows the wretchedness of the other, and the greatness of God's gift. For consider, he says, what you were, and what you have been made. What then were ye? Dead, and ruined by a destruction which could not from any quarter be repaired. For neither was there any one who had the power to assist you. And what have ye been made out of those dead ones? Alive with immortal life. And by whom? By the all-powerful God. Ye ought therefore to marshal yourselves under Him with as much cheerful readiness, as men would who had been made alive from being dead. "And your members as instruments of righteousness." Hence, the body is not evil, since it may be made an arm of righteousness. But by calling it an arm, he makes it clear that there is a hard warfare at hand for us. And for this reason we need strong armor, and also a noble spirit, and one acquainted too with the ways of this warfare; and above all we need a commander. The Commander however is standing by, ever ready to help us, and abiding unconquerable, and has furnished us with strong arms likewise. Farther, we have need of a purpose of mind to handle them as should be, so that we may both obey our Commander, and take the field for our country.