About the book:
A small, concise volume containing 24 or so poems about justice, patience, the Divine, and the soul.
ADDRESS TO THE SOUL
Forty years of thy precious existence have expired;
Yet thy life hath not passed beyond childhood.
Thou hast spent all in lust and licence;
Not a moment hast thou acted according to righteousness.
Rely not upon unstable life;
Be not confident that thou art safe from the sport of fortune.
About Sadi (from Wikipedia):
Abū-Muhammad Muslih al-Dīn bin Abdallāh Shīrāzī, better known by his pen-name as Saʿdī, was one of the major Persian poets of the medieval period. He is not only famous in Persian-speaking countries, but has been quoted in western sources as well. He is recognized for the quality of his writings and for the depth of his social and moral thoughts. Saadi is widely recognized as one of the greatest poets of the classical literary tradition.