Sin is bad for you 

When you knowingly sin, it puts your body under stress. There is actually no such thing as a “lie detector test.” The fact is, the test cannot determine if someone is lying. It simply measures how a person’s response to certain questions impacts their nervous system. God designed our system to glorify Him (see 1 Corinthians 6:19-20). So when you sin, it negatively impacts your body. Even if you have never taken a polygraph exam, you can agree that when you have lied, you probably experienced an increase in your heart rate. So when God tells you not to sin, He is not trying to steal your joy but preserve it. Sin robs you of three things: (1) Comfort. “‘There is no peace for the wicked,’ says the Lord” (Isaiah 48:22 NLT). When you knowingly violate your values, you become uneasy in your own skin. (2) Character. Your reputation is how others see you, but your character is what you see when you look at yourself in the mirror each day. Your thoughts determine your deeds, your deeds determine your habits, your habits determine your character, and your character determines your destiny. (3) Confidence. Nothing in life is more important than to be able to approach God with confidence. “If we don’t feel guilty, we can come to God with bold confidence. And we will receive from him whatever we ask because we obey him and do the things that please him” (1 John 3:21-22 NLT). So the next time Satan tempts you to sin, stop and do the math. By looking at the bottom-line result, you will be able to make the right choice every time.