"Blessed are the pure in heart, for they will see God." - Matthew 5:8

Search me, God, and know my heart; test me and know my anxious thoughts. - Psalm 139:23

Create in me a clean heart, O God, and renew a right spirit within me. - Psalm 51:10

Finally, brothers and sisters, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable—if anything is excellent or praiseworthy—think about such things. - Philippians 4:8