Happiness and misery are products of the mind and to be able to enjoy life one should cultivate and pursue right resolutions. How this can be done is explained in this book.
I am the thread that runs through all these pearls, and each pearl is a religion or even a sect thereof. Such are the different pearls, and God is the thread that runs through all of them; most people, however, are entirely unconscious of it.
-Swami Vivekananda