What does the Bible say about iniquity?

Iniquity is a term frequently used in the Bible to describe sin, specifically as something that does not balance with the required weight of God's perfect righteousness. It is a condition wherein even our best efforts at religion or morality are deemed inadequate when placed against the absolute perfection of Christ. As illustrated in scriptures like Matthew 7:21, even religious acts can be categorized as iniquity if they do not correspond to the righteousness of Christ. Thus, iniquity reflects humanity's blindness to its own shortcomings, which God must reveal to us.