A Calendar of Wisdom: Daily Thoughts to Nourish the Soul, Written and Selected from the World's Sacred Texts by Leo Tolstoy

A Calendar of Wisdom is structured as a daily devotional, featuring a collection of thoughts, aphorisms, and short passages for each day of the year. Tolstoy spent 15 years compiling and revising the work, drawing from an extensive array of sources, including the Bible, the Koran, Greek philosophy (Epictetus, Socrates, Marcus Aurelius), Buddhism (Buddha), and thinkers like Kant, Emerson, and Lao-Tzu. Each daily entry is organized around a theme and often includes Tolstoy's own reflections, framing the thoughts of others. The book was widely read in pre-revolutionary Russia but was later banned under Communist rule, only to be rediscovered and published in its first English edition in 1997.