David, in the prime years of his life, was a mighty warrior and a powerful leader in Israel. In battle, it says, “the Lord preserved David whithersoever he went” (2 Samuel 8:2). But after forty years as king, 1 Kings 1:1 says of him that he had become weak and scarcely able to function on his own – “Now David was old and stricken in years; and they covered him with clothes, but he got no heat”. As…