Your heart's desire is God's will.  God wants you to do what you were made for.  And that is your heart's desire.  It comes from the spark of divinity in every man.  By doing the right thing for yourself is doing your heart's desire, you change your consciousness by following God's law which is built into you heart.  It is just waiting to get out.  Pursue it and you live your wildest dreams as you've imagined how good it could be.