v. The Christian who has true repentance has already received pardon from God altogether apart from an Indulgence, and does not need one; Christ demands this true repentance from every one. vi. The Treasury of Merits has never been properly defined, it is hard to say what it is, and it is not properly understood by the people; it cannot be the merits of Christ and of His saints, because these act of themselves and quite apart from the intervention of the Pope; it can mean nothing more than that the Pope, having the power of the keys, can remit ecclesiastical penalties imposed by the Church; the true Treasure-house of merits is the Holy Gospel of the grace and glory of God. The Archbishop of Mainz, finding that the publication of the _Theses_ interfered with the sale of the Indulgences, sent a copy to Rome. Pope Leo, thinking that the whole thing was a monkish quarrel, contented himself with asking the General of the Augustinian Eremites to keep his monks quiet. Tetzel, in conjunction with a friend, Conrad Wimpina, published a set of counter-theses. John Mayr of Eck, professor at Ingolstadt, by far the ablest opponent Luther ever had, wrote an answer to the _Theses_ which he entitled _Obelisks_;(163) and Luther replied in a tract with the title _Asterisks_. At Rome, Silvester Mazzolini (1460-?) of Prierio, a Dominican monk, papal censor for the Roman Province and an Inquisitor, was profoundly dissatisfied with the _Ninety-five Theses_, and proceeded to criticise them severely in a _Dialogue about the Power of the Pope; against the Presumptuous Conclusions of Martin Luther_. The book reached Germany by the middle of January 1518. The Augustinian Eremites held their usual annual chapter at Heidelberg in April 1518, and Luther heard his _Theses_ temperately discussed by his brother monks. He found the opposition to his views much stronger than he had expected; but the discussion was fair and honest, and Luther enjoyed it after the ominous silence kept by most of his friends, who had thought his action rash. When he returned from Heidelberg he began a general answer to his opponents. The book, _Resolutiones_, was probably the most carefully written of all Luther’s writings. He thought long over it, weighed every statement carefully, and rewrote portions several times. The preface, addressed to his Vicar-General, Staupitz, contains some interesting autobiographical material; it was addressed to the Pope; it was a detailed defence of his _Theses_.(164)