Total depravity is a phrase or name that is used to summarize what the Bible teaches about the spiritual condition of fallen man. It is the “T” in the acronym TULIP, which is commonly used to enumerate what are known as the five points of Calvinism or the doctrines of grace. Because the name “total depravity” can cause people to have wrong ideas about what is meant, some people prefer to use terms like “total inability,” “righteous incapability,” “radical corruption” or even “moral inability.” Yet what is important is not the name assigned to the doctrine but how accurately the doctrine summarizes what the Bible teaches about the spiritual condition of fallen man. No matter which name you use to refer to “total depravity,” the fact remains that when properly understood it is an accurate description of what the Bible does teach on this important subject.
While often misunderstood, the doctrine of total depravity is an acknowledgement that the Bible teaches that as a result of the fall of man (
Genesis 3:6) every part of man—his mind, will, emotions and flesh—have been corrupted by sin. In other words, sin affects all areas of our being including who we are and what we do. It penetrates to the very core of our being so that everything is tainted by sin and “…all our righteous acts are like filthy rags” before a holy God (
Isaiah 64:6). It acknowledges that the Bible teaches that we sin because we are sinners by nature. Or, as Jesus says, “So every good tree bears good fruit, but the bad tree bears bad fruit. A good tree cannot produce bad fruit, nor can a bad tree produce good fruit.” (
Matthew 7:17-18).
The total depravity of man is seen throughout the Bible. Man’s heart is “deceitful and desperately wicked” (Jeremiah 17:9). The Bible also teaches us that man is born dead in transgression and sin (Psalm 51:5, Psalm 58:3, Ephesians 2:1-5). The Bible teaches that because unregenerate man is “dead in transgressions” (Ephesians 2:5), he is held captive by a love for sin (John 3:19; John 8:34) so that he will not seek God (Romans 3:10-11) because he loves the darkness (John 3:19) and does not understand the things of God (1 Corinthians 2:14). Therefore, men suppress the truth of God in unrighteousness (Romans 1:18) and continue to willfully live in sin. Because they are totally depraved, this sinful lifestyle seems right to men (Proverbs 14:12) so they reject the gospel of Christ as foolishness (1 Corinthians 1:18) and their mind is “hostile toward God; for it does not subject itself to the law of God, for it is unable to do so” (Romans 8:7).
Got answer above, very insightful imo.