According to The American Heart Association, endurance is one of the four exercises that help keep the body fit and strengthen the heart muscle. But what about our spiritual hearts? In Paul’s letter to the Romans, he tells us that problems and trials help us develop endurance. But just as endurance exercise strengthens our physical hearts, enduring trials develops character and strengthens our spiritual hearts. In times when you feel weighed down with problems and trials, and it seems as if you can’t take another step, that’s a good time to look up. Trusting in God during difficult times develops character and strengthens our hope. And godly hope does not disappoint.
https://oneminutedevotions.net/devotions/character-the-other-heart-muscle-4l5yr