You can hit a nail on the head, or cause a machine to do so, and get a fairly predictable result. Hit a dog on the head, and it will either dodge, bite back, or die, but it will never again react in the same way. We can predict only those things we set up to be predictable, not what we encounter in the real world of living and reactive processes.
Your mind is reason, your heart is your conscience, and in your heart - you will find truth. This is why Truth is always recognized first by the heart. Our minds are simply there to reason with our conscience. The only thinking that matters is that which passes through the heart. Your heart is what connects you to the light of God. He who acts through his heart, truly stands by God.