How do we know that all humans are sinners?

According to Romans 3:23, 'all have sinned and fall short of the glory of God,' which establishes that there are no exceptions to human sinfulness. This truth is essential in understanding our condition before God; it is not merely that some are good and others are bad, but rather that we all share in a common sinful nature. This concept is reinforced throughout Scripture as God articulates the need for a savior because of humanity’s incapacity to attain righteousness through moral endeavors. Recognizing this status as sinners is foundational to experiencing grace and understanding the essence of the gospel.