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.
Learning and wisdom are superfluities, the surface glitter merely, but it is the heart that is the seat of all power. It is not in the brain but in the heart that the Atman, possessed of knowledge, power, and activity, has its seat.
-Swami Vivekananda