Gratitude is one of the keys to a happy life, but it must be practiced. Right teaching, self-sacrifice, and hardship in life often contribute to building gratitude.
For most of my medical career, I have cared for military members, past and present. Many were impressive. One patient in Schweinfurt, Germany in the late 1990s had climbed Point Du Hoc with the 2nd Ranger Battalion on D-Day. Other patients flew bombing raids over Japan in campaigns led by Hap Arnold and Curtis LeMay. Several fought with MacArthur in Korea. And of course, many had seen combat in Vietnam, Iraq, or Afghanistan.