Charles Ellicott Commentary Romans 6:16

"Know ye not, that to whom ye present yourselves [as] servants unto obedience, his servants ye are whom ye obey; whether of sin unto death, or of obedience unto righteousness?" — Romans 6:16 (ASV)

Know ye not.—An apparent tautology, but one which really teaches a deep ethical truth. Don’t you know that what you make yourselves that you become? The habit which you form ends by becoming your “second nature.”