What does Psalm 130:3 mean?

When others accuse, there is at least a chance of error. The charge might be false or exaggerated. Critics may be corrupt themselves. But God's judgment is perfect and His perspective is always correct. When the Lord takes note of someone's sin there is no possible defense (Deuteronomy 32:3–4; Psalm 143:2). He is justified in delivering punishment to those who violate His nature (Psalm 7:11; Jeremiah 9:7). Fortunately, as this prayer continues (Psalm 130:1–2), the writer will note (Psalm 130:4) that God is also willing to forgive (Psalm 103:10–14).

Because everyone sins, everyone stands guilty and condemned in God's sight. This applies most importantly to individual people, but it can also explain the actions of entire nations. Isaiah compared Israel in his day to a body suffering from illness (Isaiah 1:5–6). Similarly, Jeremiah noted that the human heart is deeply flawed (Jeremiah 17:9). Paul famously noted that every person is guilty of sin before the Lord (Romans 3:10–13, 23).