 In the 10th century, the Ash'ari school developed as a response to Mu'tazila, leading to the latter's decline.Ash'ari still taught the use of reason in understanding the Qur'an, but denied the possibility to deduce moral truths by reasoning.This was opposed by the school of Maturidi, which taught that certain moral truths may be found by the use of reason without the aid of revelation.