Psalm 27:3 (NIV) Though an army besiege me, my heart will not fear; though war break out against me, even then will I be confident.
Psalm 51:17 (NIV) The sacrifices of God are a broken spirit; a broken and contrite heart, O God, you will not despise.
Proverbs 4:23 (NLT) Guard your heart above all else, for it determines the course of your life.
Matthew 5:8 (NLT) God blesses those whose hearts are pure, for they will see God.
Luke 6:45 (NLT) A good person produces good things from the treasury of a good heart, and an evil person produces evil things from the treasury of an evil heart. What you say flows from what is in your heart.
An Arab proverb runs thus: "The neck is bent by the sword, but heart is only bent by heart." Love is irresistible. D. L. Moody, Anecdotes, Incidents and Illustrations.