 While in early Islam, ‘aql was opposed to "jahl" "ignorance", the expansion of the concept meant it was now opposed to "safah" "[deliberate] stupidity" and "junūn" "lack of sense, indulgence".Under the influence of Mu‘tazilī thought, ‘aql came to mean "dialectical reasoning".In Shī‘ī jurisprudence, ‘aql is the process of using intellect or logic to deduce law.