Magnificent Obsession (1954)

When churlish, spoiled rich man Bob Merrick foolishly wrecks his speed boat, the rescue team resuscitates him with equipment that’s therefore unavailable to aid a local hero, Dr. Wayne Phillips, who dies as a result. Phillips had helped many people, and when Merrick learns Phillips’ secret, to give selflessly and in secret, he tries it in a ham-handed way.