Relation between reason (Aql) and divine law (Shariat)

The topic of this discussion concerns relation between reason an divine law from the viewpoint of Ayatollah Mirza Mahdi Esfahani (1303-1365 A.H.). Mirza Esfahani believes that reson (Aql) is a light which Almighty Allah bestows upon mankind and sets it as His proof (Hujjat) upon them. The argument and authority of all other authorities goes back to "Aql". Of course the divine laws are legalized proportionally on the basis of interests and mischif¨s. This legalization of divine laws is the work of the All-Wise Allah.