My preference is for inspirational literature, though such a choice is a personal one. But for the interested, here are some to consider: Zen, the Reason of Unreason; The Wisdom of Confucius; the Torah; the Holy Bible; Tao, to Know and Not Be Knowing; The Meaning of the Glorious Koran: An Explanatory Translation; As a Man Thinketh; The Essential Gandhi; Walden, or, Life in the Woods; the Book of Mormon; The Meditations of Marcus Aurelius; and the Upanishads.
Apply this routine.
