THE HEART CAN BE A SOURCE OF GOOD OR EVIL
THE HEART CAN CONTROL YOUR SPEECH
Luke 6:45: A good man out of the good treasure of his heart bringeth forth that which is good, and an evil man out of the evil treasure of his heart bringeth forth that which is evil: for of the abundance of the heart his mouth speaketh.
WORDS CAN ALSO BE A SOURCE OF FAITH
Romans 10:10: But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach;9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.10 For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
Psalm 19:14 Let the words of my mouth, and the meditation of my heart, be acceptable in thy sight, O Lord, my strength, and my redeemer.