Separate *Isaiah 1:18-20

Sin kills. Sin brings death. Repent; turn away from your sin(s) and God will forgive you. He will cleanse you from all unrighteousness and sin. God loves and is longing to bless His people, but He cannot tolerate sin. When we turn from our sinful ways He forgives, cleanses, and blesses. Sin separates us from the presence of God.
As David prayed: Search me O God, You know my thoughts. If there be any sin in my heart or mind reveal it so I can repent and come clean before You. David wanted nothing to get in the way of his relationship with God. (Ps. 139:23 paraphrased)