A Calendar of Wisdom is a collection of quotes and insights written and compiled by Leo Tolstoy over 15 years in the early 20th century. It contains daily thoughts from great philosophers from many eras and covers a wide range of subjects and ideas.
The English translation was made by Peter Serkirin in 1997 in his excellent volume of the original text. I highly recommend you purchase a copy.
If you have any corrections or suggestions, please let me know. I am best reached by email (roryflintphoto at gmail) or on twitter.