The heart is one of the most delicate part of any person. The heart is at the center of who we are, and often a conduit for some of the decisions we make in life. However, the heart can equally be deceptive, because our hearts are also tied to our emotions, hence, many of our decisions are made based on whether we feel great about something or not.
The deception of the heart is in the disconnect between what we see and what we feel. You have to understand that the heart can be right or wrong, depending on where your heart is. When the prophet Samuel went to anoint a king over Israel, God told him that He looked at the heart and not at their physical appearance (1 Samuel 16), yet many of us fall into the deception of what we see, falling in love with what they see, and ignoring what they feel or ignoring what they see and favoring what they feel. There has to be a balance to what we see and feel, because as much as the heart is a precious element of who we are, it can lead to what we want the most that will help us in life, or what we want the most that will crush the very foundation of who we are.
The delicate nature of who you are is the reason you should be careful what or who you commit your heart to. You must understand that the heart seeks what makes it comfortable and at ease, but might not necessarily satisfy your God desire. The comfortable nature of your heart is the reason you could find yourself in a very uncomfortable situation and not even know it, especially without a thinking mechanism. If your heart cannot think, then it cannot possess the ability to process an idea, execute or even make an adjustment to suit your needs. This is the reason the heart can easily be deceptive; it feels great at something until it is met with resistance, then feels betrayed. Your mind is the part of you that determines whether what you see is appropriate to pursue or not. It is significant to be passionate about something, but it is your mind that will be useful in determining what course of action to take, or even if you should pursue it. A heart, left unguarded, can lead you into places you did not imagine.
Follow your heart, but do not be deceived by what your eyes and mind cannot confirm.