 Some liberal Muslim authors, such as Fatima Mernissi (1992), argue that the rise of conservative forms of Islamic philosophical theology stifled more scientifically-minded natural philosophy. In the ninth to the twelfth century, the Mu’tazila (a philosophical theological school) helped the growth of science in the Islamic world thanks to their embrace of Greek natural philosophy. But eventually, the Mu’tazila and their intellectual descendants lost their influence to more conservative brands of theology. Al-Ghazālī’s influential eleventh-century work, The Incoherence of the Philosophers (Tahāfut al-falāsifa), was a scathing and sophisticated critique of Greek-inspired Muslim philosophy, arguing that their metaphysical assumptions could not be demonstrated. This book vindicated more orthodox Muslim religious views. As Muslim intellectual life became more orthodox, it became less open to non-Muslim philosophical ideas, which led to the decline of science in the Islamic world, according to this view.