"Paradise of Submission (Rawda-yi taslim), is Tusi's most important and comprehensive Ismaili work. It consists of 27 chapters called tasawwurat (meaning 'reflections' or 'representations') on a variety of themes such as the Creator and the cosmos, the nature of human existence, ethics and human relations, religion, eschatology, prophethood and imamate. Additionally, there are chapters on the varieties of human knowledge, the nature of language, different forms of worship, and the soul's progression from corporeality to spirituality." "The significance of this treatise arises not only from its comprehensive treatment of medieval Ismaili thought, with its characteristic synthesis of theology, philosophy and esotericism, but also from its unique status as the only major doctrinal work of the early Nizari Ismailis to have survived the Mongol invasions of Iran in the 7th/13th century." This new Persian edition and complete English translation of the Rawda-yi taslim has been prepared by S.J. Badakhchani on the basis of several known as well as recently discovered manuscripts of the text, and accompanied with an introductory essay by Hermann Landolt and a philosophical commentary by Christian Jambet.
Muhammad ibn Muhammad ibn al-Hasan al-Tūsī, better known as Nasir al-Din Tusi, was a Persian polymath, architect, philosopher, physician, scientist, and theologian. One of the greatest scientists of medieval Islam, he is often considered the creator of trigonometry as a mathematical discipline in its own right.