1. The “total” in total depravity does not mean that everyone is as corrupt as possible or that everyone is destitute of all moral virtues. It means that sin affects all of our thought, faculties, and activities to some extent so that no one is pure or righteous in anything (Genesis 6:5; Matthew 15:19).
2. Total depravity began when Adam and Eve sinned; it can be seen in their changed nature—e.g., blaming others for their sin, deteriorating from friend of God to hiding from Him, and deviating from innocence regarding their nakedness to shame (Genesis 3:6–13); and it has been conveyed to all of their descendants (Job 15:14; Psalm 51:5; Ecclesiastes 9:3; Isaiah 53:6).
3. Total depravity is seen in the prevalence of every kind of sin in the world (Galatians 5:17–21).
4. Total depravity is seen in the early manifestation of sin in children (Genesis 8:21; Psalm 58:3; Proverbs 22:15).
5. Total depravity is evidenced by unregenerate humanity’s total and universal disregard for God’s claims on everyone’s supreme reverence, love, and obedience (Romans 1:18–32; 8:5–8).
6. Total depravity is seen in humanity’s general rejection of Jesus Christ (John 1:11; Isaiah 53:3).
7. Depravity is incurable by man, and it leaves him completely dependent on God’s grace for salvation (Isaiah 64:6–7; Jeremiah 17:9; John 3:3; Romans 1:17; 3:23–24; Galatians 2:21; Ephesians 2:4–9).
8. God’s people in every age have given witness to their own depravity (Job 40:4; 42:6; Psalm 51:5; Isaiah 6:5; Romans 7:23–24; Ephesians 2:3; 1 Timothy 1:15).
*Adapted from various sources, especially Charles Hodge, Systematic Theology, 3 vols. (reprint, Grand Rapids, Mich.: Eerdmans, 1993), 2:233–238.
You may want to also read the article “No One Is Good.”