His attitude in matters of worship was conservative, and in the Leipsic Interim he was said by Cordatus and Schenk even to be Crypto-Catholic. He never strove for a reconciliation with Roman Catholicism at the price of pure doctrine. He attributed more value to the external appearance and organization of the Church than Luther did, as can be seen from his whole treatment of the "doctrine of the church". The ideal conception of the church, which the reformers opposed to the organization of the Roman Church, which was expressed in his "Loci" of 1535, lost for him after 1537 its former prominence, when he began to emphasize the conception of the true visible church as it may be found among the Protestants.