“Remember, it is sin to know what you ought to do and then not do it” (James 4:17 NLT).

THE SIN OF OMISSION
There are sins of commission and sins of omission. The first is to commit a sin by breaking a law, and the second is to omit to do the good thing that was within your power to do. The word “know” has serious implications. For although ignorance of the law is no excuse, there might be some leniency for the one without knowledge. Yet, for the one who “knows,” there is greater condemnation. For to whom much is given, much is required.
 
There is the sin of doing what you ought not to do. And there is the sin of not doing what you ought to do. Both are sin. Although most of the commands are “thou shalt not,” some are “thou shalt.” In the case of the latter, such examples being, “Love the Lord thy God with all thy heart,” and “Honor thy father and mother,” they have at least equal, if not greater weight than the former.
 
I suppose we always know more than we do. This is the problem of the heart bent by the Fall. Yet, to the one who would know and believe in Christ, the righteousness of God is imputed unto him.