Verily, the hearts of all the sons of Adam are between the two fingers out of the fingers of the Compassionate Lord as one heart. He turns that to any (direction) He likes. Then Allahs Messenger (saw) said: 0 Allah, the Turner of the hearts, turn our hearts to your obedience.
Another dua regarding the Heart taken from Sahih Muslim. Download this in Arabic and English translation to share on Facebook and other Social media sites.