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.
Do you think these sannyasi children of Sri Ramakrishna are born to simply to sit under trees lighting dhuni-fires? Whenever any of them will take up some work, people will be astonished to see their energy. Learn from them how to work.
-Swami Vivekananda