When we sin it breaks God's heart. It de-glorifies His name and the entire family of Christ. It gives our testimonies and words spoken zero weight. It creates hate doubt and unbelief for God in the unbeliever. It separates us from hearing God's voice and feeling God's presence. It makes the devil happy. It makes us blind to the truth. It hardens our heart. It sears our conscience. It's selfish. God hates it. It weakens our Spiritual armor. It hurts others we love. It creates division bitterness pain and anguish. It ruins lives. It steals destroys and sometimes kills.
It can teach life lessons to a willing heart. It refines purifies and purges a teachable/soft heart. It can become a testimony for others. It can glorify God if truly repented of and healed from. It can teach us to forgive the unforgivable just as we have been forgiven undeservingly by God. All sin is burdensome. Only God can deliver us from it IF we let Him. Confessed sin is forgiven sin.