A Treasury of Virtues is a collection by the Fatimid Shafiʿi judge al-Qudaʿi (d. 454 H/1062 AD) of sayings, sermons, and teachings attributed to ʿAli ibn Abi Talib (d. 40 H/661 AD). Of the many compilations of ʿAli’s words, A Treasury of Virtues arguably possesses the broadest compass of genres, and the largest variety of themes. Included are aphorisms, proverbs, sermons, speeches, homilies, prayers, letters, dialogues and verse, all of which provide instruction on how to be a morally upstanding human being. The shorter compilation included here, One Hundred Proverbs, is attributed to the eminent writer al-Jahiz (d. 255 H/869 AD). This volume presents a new critical edition of the Arabic based on several original manuscripts, the first English translation of both these important collections, and an extended introduction.