 Second, he integrates philosophical and spiritual reasoning because, as was common among Islamic Neoplatonists and especially in the method of Suhrawardi, he insisted that philosophy was a mode of Prophetic knowledge inherited in an initiatic chain from Adam down through the Biblical prophets, Greek philosophers, Indian and Babylonian sages through to the Prophet Muhammad and then on through the Muslim philosophers and Sufis. In his treatise on creation (Risala fi huduth al-‘alam), Mulla Sadra summaries this genealogy of philosophy from Adam and the East to the Greeks: