How does God's grace relate to our sin?

God's grace plays a pivotal role in the context of our sinfulness. As seen in Psalm 51, David appeals to God for mercy based on God's lovingkindness and abundance of tender mercies. This reflects the Reformed understanding of grace as sovereign and unmerited favor, meaning it is given according to God’s will and not our worthiness or efforts. God’s grace is described as all-powerful and independent, emphasizing that it operates without requiring anything from us prior to its action. The fullness of grace is revealed through Christ’s sacrifice, which provides cleansing from all iniquities and empowers believers to approach God with confidence, highlighting that true cleansing and forgiveness stem from accepting God's grace rather than striving in our own strength.