Heart is bridge to the soul.

Your thoughts are related to the heart. Your mind is related to the spirit. They cannot be totally separated. The heart, as you refer to it, is the energy of spirit. The mind can be the manifestation, the exercising of that energy, impacted by the human ability to choose.
You can choose to behave in opposition to what you know to be what is right or to follow what you know to be right. You can sense what you sincerely believe, and yet your actions through choice can be in opposition to all that you sense.

The heart could be said to be the bridge to the soul. The mind could be thought of as the implications through choice of what that bridge may imply.

Everyone is guided. You may be guided by words, images or hunches, but all are being guided. The mind is the exercise of choice, not the heart. If you wish the mind and the heart to work together, then you must listen to the heart, and you must trust what the heart tells you.

Sometimes your interpretation of the heart will lead you with a sense of honesty in one direction, or with that same sense of honesty in a different direction. There are many who feel they are doing what is right, and yet they are clearly misguided, as you would say. You may have pursued elements in your life where you thought you were doing what was right, and you ultimately recognized that was not the case at all. But the heart was nevertheless a part of your actions. Your actions were a fulfillment when you consciously tried to do what you felt was right.