God's word clearly points out we have a bad heart.  It is this heart that defiles a person, by just the thought of sin.  This was discussed in part 3.  In this passage God clearly establishes the fact we have a bad heart, but also that this bad heart is the cause of out death.  We are warned the same bad heart Israel had in the OT is the same bad heart we have in the NT.  If we don't fix the bad heart by receiving a new heart, then we will be doomed to destruction just as much of Israel was in the OT.Passages covered:  Genesis 6:5, 8:21; Number 15:39-40, ch 16; Deuteronomy 29:4-5; 1 Chronicles 28:9; 1 Kings 11:1-13; Psalm 14:1-3, 15:1-4, 78:5-8/28-37, 81:10-13, 95:7-11; Proverbs 26:23-25; Isaiah 6:9-10 [Acts 28:27, John 12:37-40, Mathew 13:12-15]; Isaiah 29:13 [Mathew 15:8]; Isaiah 44:18, 55:7-9; 1 Corinthians 2:11-12; Jeremiah 7:3-7, 24, 8:3-6, 17:1, 5-13, 23:17; Zechariah 7:11-13; Hebrews 3:6-18, 4:6-7, 11-12; 2 Peter 2:14, 19-22; Leviticus 26:40-42, Jeremiah 4:4, 14, 9:26; Acts 7:51; 1 Corinthians 7:18-19; Philippians 3:2-3