Rational and Qur anic Proofs of Rational and Essential Goodness and Badness of Acts

One of the controversial issues between 'Adilites (the twelvers and Mutazilites) and Ashʻarites is the intellectual- essential goodness and badness of acts. ʻAdlites advocate the idea of rational and essential goodness and badness of acts, but Ashʻarites reject it and believe in legal goodness and badness of acts. ʻAdlites, especially Twelvers, say that there are different rational and transmitted proofs for the goodness and badness of acts. Accepting this idea exerts many effects on theology, guide-knowing, ethics and precepts.Giving a descriptive, the present paper explores Quranic and rational evidence to confirm the idea of rational and essential goodness and badness of acts. The most important findings of this research show that, according to rational and Qur’anic evidence the goodness and badness of acts are essential, not conventional, man’s intellect comprehends the goodness and badness of acts and most of the necessary and doctrinal issues in Islam depend on rational and essential goodness and badness of acts.