Ah, yes, I have I asked myself that question before. I deffinatly have to say my mind. Why??? Because if you listen to your heart, it can get you into alot of trouble. Like, for example, if you really loved someone, and they asked you to leave your life behind and run away from your family with them, your heart would say yes, but your mind would say no. Mostly, just go by your mind. The possibility of heartbreak and failure will go down a good amount if you use your head.