‘Reason and revelation’ points out that in the Islamic world, there was no hard-and-fast distinction between theology, which draws on revelation, and philosophy, which uses only the natural light of reason. Rather, rationalist theologians were in constant conversation with thinkers influenced by Hellenic philosophy. It looks at different attitudes to the limits of human reason, which for many were epitomized by Aristotle in his logical treatises, known as the Organon. Logic was an indispensable instrument for doing philosophy, eagerly adopted by Al-Kindī and other adherents of falsafa. Others, like Ibn Taymiyya, criticized the discipline of logic. The ideas and works of key philosophical thinkers such as al-Fārābī, Averroes, Al-Ghazālī, Suhrawardī, and Mullā Ṣadrā are also considered.