How do we know that all men are not basically good?

While many may argue for the inherent goodness of humanity, the Bible provides a counter-narrative that highlights the reality of sin. Romans 3:10-12 tells us that 'there is none righteous, no, not one.' This underscores the fallen nature of man, which affects our ability to achieve goodness on our own. In contrast to the subjective goodness that can be defined by societal standards, the absolute standard of goodness is found in Christ alone. Our comparative nature can lead to an illusion of goodness, but when judged against the holiness of God, even our best efforts are described as 'filthy rags' (Isaiah 64:6). Thus, the recognition of our sinfulness points to our need for God’s mercy and grace in Jesus Christ to be truly good.