The Untrained Heart

Why do we question our instincts? Or why do we think twice after acting instinctively? And why do we question our rationality? Just because instincts do not originate out of our mind or what we call as logical rational thinking?
We simply forget the fact that no matter what heart can never be trained unlike our mind. It's difficult to know how our heart will react under unforeseeable situations. It's always a mystery..whereas mind can be trained through learning, education and discipline. It's easy to train a mind regarding the probable responses or reactions to a certain situation like we nurture a sense of alertness and awareness  in relation to dangerous situations. In a way we can manipulate our very own mind.
But heart can never be manipulated or told from beforehand about how to react. It has it's own sense. Instincts are signs which are non-manipulated and not well thought of because they are from the heart. Their is immense purity in them, almost like signs of God. 
If we rely on our untrained, untamed heart we would never fail because the instincts originate out of good intentions and their very essence is pure.