The misery of the world. This is a concept of Ignatian Spirituality called the first principal and foundation - I am not evangelizing here, so feel free to discount the God parts if one wishes. But I think in these paragraphs are the keys to man's happiness - been working at this for a bunch of years, not even close yet. But always thought there were a lot of answers here.
God who loves us creates us and wants to share life with us forever. Our love response takes shape in our praise and honor and service of the God of our life.
All the things in this world are also created because of God’s love and they become a context of gifts, presented to us so that we can know God more easily and make a return of love more readily.
As a result, we show reverence for all the gifts of creation and collaborate with God in using them so that by being good stewards we develop as loving persons in our care of God’s world and its development. But if we abuse any of these gifts of creation or, on the contrary, take them as the center of our lives, we break our relationship with God and hinder our growth as loving persons.
In everyday life, then, we must hold ourselves in balance before all created gifts insofar as we have a choice and are not bound by some responsibility. We should not fix our desires on health or sickness, wealth or poverty, success or failure, a long life or a short one. For everything has the potential of calling forth in us a more loving response to our life forever with God.
Our only desire and our one choice should be this: I want and I choose what better leads to God’s deepening life in me.