What does the term 'iniquity' mean in biblical context?

Iniquity, as described in Scripture, pertains to the perversion of righteousness and indicates a deeper level of moral failure. It encompasses our good deeds that are ultimately tainted by selfishness or pride, as highlighted in Isaiah 64:6, where it is stated that even our righteousness is like filthy rags. Psalm 51 speaks of the need for God to cleanse us from all iniquity, emphasizing the understanding that even our most pious intentions can be corrupted without divine grace. Hence, recognizing iniquity helps believers understand their total depravity and the necessity of God's intervening grace.