I'm a true believer in karma. You get what you give, whether it's bad or good.
Things don't just happen in this world of arising and passing away. We don't live in some kind of crazy, accidental universe. Things happen according to certain laws, laws of nature. Laws such as the law of karma, which teaches us that as a certain seed gets planted, so will that fruit be.
You can't connect the dots looking forward; you can only connect them looking backwards. So you have to trust that the dots will somehow connect in your future. You have to trust in something - your gut, destiny, life, karma, whatever. This approach has never let me down, and it has made all the difference in my life.
I'm a great believer in karma, and the vengeance that it serves up to those who are deliberately mean is generally enough for me.
Problems or successes, they all are the results of our own actions. Karma. The philosophy of action is that no one else is the giver of peace or happiness. One's own karma, one's own actions are responsible to come to bring either happiness or success or whatever.