reasons by an administrative authority serves a salutary purpose, namely, it excludes chances of arbitrariness and ensures a degree of fairness in the process of decisionmaking. The said purpose would apply equally to all decisions and its application cannot be confined to decisions which are subject to appeal, revision or judicial review. In our opinion, therefore, the requirement that reasons be recorded should govern the decisions of an administrative authority exercising quasi-judicial functions irrespective of the fact whether the decision is subject to appeal, revision or judicial review. It may, however, be added that it is not required that the reasons should be as elaborate as in the decision of a court of law. The extent and nature of the reasons would depend on particular facts and circumstances. What is necessary is that the reasons are clear and explicit so as to indicate that the authority has given due consideration to the points in controversy. The need for recording of reasons is greater in a case where the order is passed at the original stage. The appellate or revisional authority, if it affirms such an order, need not give separate reasons if the appellate or revisional authority agrees with the reasons contained in the order under challenge.”