It’s one we don’t think about. I imagine you haven’t heard a sermon on it in a long time, if ever. It first came up in Deuteronomy and was re-emphasized a few times in the New Testament. More importantly, it has incredible potential to keep you and me out of deep messes. We can hardly imagine why it is important at all, but it got enough mileage in Scripture to show us the Lord thought it a worthy concept.
At times the heart may produce symptoms of a possible problem that requires immediate medical attention while at other times produce mild symptoms that cause no need for concern at all. For example, a person that is relaxing in a lazy chair may need to consult a medical professional should his heart begin to accelerate at great speed without cause. On the other hand, someone who has been running a marathon would not be as concerned with a higher heart-rate.