The heart in all languages is considered as the leading principle of action and of character.
"A good man, (saith the Lord Jesus) 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 out of the abundance of the heart the mouth speaketh." (Luke 6:45) Hence a change of circumstances in spiritual concerns, from darkness to light, is called"the taking away the heart of stone, and giving an heart of flesh, turning the heart of the fathers to the children, and the children to the fathers."Hence the Lord saith, in reference to his whole church, "I will give them one heart, and one way, that they may fear me for ever." (Jeremiah 32:39)