The repetition of the word "know" in verses 1, 6, and 9 [of Romans 6] indicates that Paul wanted us to understand a basic doctrine. Christian living depends on Christian learning; duty is always founded on doctrine. If Satan can keep a Christian ignorant, he can keep him impotent. - Warren W. Wiersbe [pg. 61]
The godly Presbyterian preacher, Robert Murray McCheyne, was passing out tracts one day and handed one to a well-dressed lady. She gave him a haughty look and said, "Sir, you must not know who I am!"
In his kind way, McCheyne replied, "Madam, there is coming a day of judgment, and on that day it will not make any difference who you are!" - Warren W. Wiersbe [pg. 114]
Your mind controls your body, and your will controls your mind. Many people think they can control their will by "willpower," but usually they fail. (This was Paul's experience as recorded in Romans 7:15-21.) It is only when we yield the will to God that His power can take over and give us the willpower 9and the won't power!) that we need to be victorious Christians. - Warren W. Wiersbe [pg. 139]