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.
Be strong! ... You talk of ghosts and devils. We are the living devils. The sign of life is strength and growth. The sign of death is weakness. Whatever is weak, avoid! It is death. If it is strength, go down into hell and get hold of it! There is salvation only for the brave. None but the brave deserves the fair. None but the bravest deserves salvation.
-Swami Vivekananda