JAMES 4:17
"Remember, it is a sin to know what you ought to do and then not do it!"
There is a legal concept that can help to illustrate today's truth. In law there are two kinds of errors, or what we call sins. There is an error of commission. That means that the party commits an act of breaking the law. He commits sin. Then there is an error or sin that is one of OMISSION. That means that the party failed to act and by doing so broke the law or as we say sinned. Essentially is a sin to know what you ought to do and then not do it. You are breaking God's law and in certain cases you are breaking man's laws also. You need to remember this!
The best example that we can think of has to do with your personal relationship with Jesus Christ. Everyone has had an opportunity to hear the Good News and the Saving Grace of Jesus Christ. Everyone has written on their hearts and minds the fact that there is a God and He has expectations of you. Your purpose in being here on earth is to worship the Lord God. You are to believe in Him and His resurrection. Jesus is the only one who can save you from death and eternal damnation. If you accept the Lord you will be saved. If you reject the Lord you will be lost and separated eternally. Most importantly, you know what you ought to do, but you have not done it. This is the unpardonable sin.
Those who reject God do it with full knowledge of their desire to reject God and His laws. They do not want to be burdened by bending their knee and confessing with their tongue that Jesus Christ is the Lord God. They do not want to give up control of their lives and their ability to conduct themselves in any way they see fit. They do not believe in sin or hell or the devil or any consequences for their actions. Remember it is a sin to know what you ought to do and then not do it. It is an unforgivable sin to know what you have to do in your relationship with the God of this universe and then not do it. It is appointed unto man to die once, and then the judgement. You will be judged by your actions. There will be consequences to your sin of OMISSION. Get right with God now, JUST DO IT!