Sarah Josepha Buell Hale (1851). “The Way to Live Well: And to be Well While We Live, Containing Directions for Choosing and Preparing Food in Regard to Health, Economy, and Taste”, p.19
Swami Vivekananda, Swami Adiswarananda (2006). “Vivekananda, World Teacher: His Teachings on the Spiritual Unity of Humankind”, p.78, SkyLight Paths Publishing
"A New Model of the Universe: Principles of the Psychological Method in Its Application to Problems of Science, Religion and Art". Book by P.D. Ouspensky, 1931.