Proverbs 28:13 (NLT)
13 People who conceal their sins will not prosper, but if they confess and turn from them, they will receive mercy.

The Hebrew word for conceal is kacha, which means to cover over, such as one might cloth themselves, Tsalach is the word for proper, which means to bring success, or to show or experience properity. King Solomon was conveying those who keep sin secret will not find success, but when the reveal their sin they will receive mercy.

There is an inconvenience about sin. In order to own it we have to admit to it. Most often we would rather keep it a secret; filed away where no one can see it. The problem is that once we hide one sin, we learn can hide others; at least for a while. One example I can think of is a woman who was on the run from the law for years. She had settled into a normal life, but always carried the fear she one day would be found out. Eventually law enforcement caught up with her and she had to face her charges even though she had started a new life. When we place our faith in Christ we are given a new life; one that is free from the penalty of sin. There is no reason to hide, except we fear the earthly consequences of our actions. If we hide a sin that fear increases with each new sin we choose to hide. Eventually those sins may be found out and what did we gain but years of fear and the sin was still exposed. The Bible tells us we should confess out sins to one another and to God. There is accountability in the confession of sin and it keeps us from hiding that which will destroy us.