Thus the two evils of traffic in ecclesiastical offices, shortly stigmatised as simony and concubinage--for the laws of the Church forbade any more decent description of the relationship--threatened to absorb the Church within the State. Professional interests and considerations of morality alike demanded that these evils should be dealt with. Ecclesiastical reformers perceived that the only lasting reformation was one which should proceed from the Church herself. It was among the secular clergy, the parish priests, that these evils were most rife. The monasteries had also gone far away from their original ideals; but the tenth century had witnessed the establishment of a reformed Benedictine rule in the Congregation of Cluny, and, in any case, it was in monastic life alone that the conditions seemed suitable for working out any scheme of spiritual improvement. The Congregation of Cluny was based upon the idea of centralisation; unlike the Abbot of the ordinary Benedictine monastery, who was concerned with the affairs of a single house, the Abbot of Cluny presided over a number of monasteries, each of which was entrusted only to a Prior. Moreover, the Congregation of Cluny was free from the visitation of the local bishops and was immediately under the papal jurisdiction. What more natural than that the monks of Cluny should advocate the application to the Church at large of those principles of organisation which had formed so successful a departure from previous arrangements in the smaller sphere of Cluny? Thus the advocates of Church reform evolved both a negative and a positive policy: the abolition of lay investiture and the utter extirpation of the practice of clerical marriages were to shake the Church free from the numbing control of secular interests, and these were to be accomplished by a centralisation of the ecclesiastical organisation in the hands of the Pope, which would make him more than a match for the greatest secular potentate, the successor of Caesar himself. [Sidenote: Chances of reform.]