The biggest problem of a person who has no difficulty in ensuring his own happiness is this: The unhappiness of others! Because it is very difficult to maintain happiness among unhappiness!
Life has a tendency to provide a person with what they need in order to grow. Our beliefs, what we value in life, provide the roadmap for the type of life that we experience. A period of personal unhappiness reveals that our values are misplaced and we are on the wrong path. Unless a person changes their values and ideas, they will continue to experience discontentment.