Hearts are peculiar things, they manage of blood through the body involuntary, just as nerves send signals to the brain. Whether we want them to or not these things are necessary for survival. I guess that’s why so many expressions involve their meaning literal or metaphorical. I read quite a bit about them but none will out last that of follow your heart, to me it is the same as follow your gut feelings. For within us I believe we have the ability to see the importance of consideration and empathy towards others. That knowledge of how we effect others drives us. Sure we all make mistakes sometimes, but daily I see a human face or even imagine it and melt at their existence and need to remember we all have hearts we need to follow.