This document summarizes the key points about the nature of human sinfulness from a biblical and theological perspective. It discusses that there are two basic kinds of sin: sins of commission which is doing what we should not do, and sins of omission which is not doing what we should do. It also lists seven detestable sins according to Proverbs 6:16-19. Theologically, sin is defined as anything that falls short of God's perfect moral nature. Some of the attributes that define God and their absence which defines sin are that God is holy but sin is being unholy, God is just but sin is unrighteousness, and God is love but sin is being unloving.