This book is a study of classical Islamic cosmology as articulated by the Ikhwān al-Ṣafāʾ, Abū Rayḥān al-Bīrūnī, and Ibn Sīnā. Tracing the Quranic doctrine of tawḥīd and creation as signs of God (āyāt Allāh), Nasr situates the cosmological sciences within the intellectual trends of the fourth and fifth Islamic centuries. He argues that true knowledge of nature derives not from the human mind alone but from the Divine Intellect, the ontological source of the cosmos. Thus, understanding the universe requires perceiving phenomena as they exist in the Divine Mind, uniting metaphysics, sacred science, and empirical inquiry.