Choices that we make

what if your heart or mind is not in agreement with your choice. If so, every obstacle you face your prickly mind will remind you what a poor choice you made or it will sadden your longing heart. what is heart and what is mind? why do they are always in conflict with each other. why don't they represent the single person you are? Or do we model them to represent ourselves and the society to justify our impulsive acts as the work of heart?