“The Most Vital Thing in Life” reads more like a self-help book to help oneself better s 'improve. Give advice in situations where you don't know what to do in a given situation. Give life lessons and know how to react when angry. The author of "The Most Vital Thing in Life" most likely came from an upper class family where making a scene would be disastrous for the family's image, so learning to keep silent and not let the Anger controlling yourself helped the author stay sane. in the face of adversity. The author of "A Poison Tree" probably came from a middle-class family and discovered that speaking your mind and your problems does wonders for the situation you find yourself in, as well as your condition. mental.