What is the Heart in Scripture?

How Can One Become “Pure of Heart”?

Scriptures Referenced

Ephesians 1:18
Romans 1:21
Romans 2:5
Matthew 12:34
Matthew 23:23–28
Matthew 15:7–9
James 4:8
1 Peter 1:14–16
Hebrews 12:14
Philippians 4:8