The pope was a humanist, not a spiritually minded priest; we may, therefore, believe that Charles Beard is not far wrong in his estimate of the possible effect of this letter upon him: "If Giovanni de Medici, the head of a house which had long come to consider itself princely, and the occupant of the Fisherman's chair, when it claimed to be the highest of earthly thrones, read this bold apostrophe, addressed to him by a 'peasant and a peasant's son,' he must have thought him mad with conceit and vanity. He was incapable of being touched by the moral nobleness of the appeal, and so audacious a contempt of merely social distinctions the world has rarely seen."[4] After the mighty thunder of the Address to the Christian Nobility and the Babylonian Captivity of the Church, the Treatise on the Liberty of a Christian Man is, indeed, like a still, small voice. Luther himself says: "Unless I am deceived, it is the whole of Christian living in a brief form." Perhaps we may trace here also the influence of St. Bernard's _De Consideratione_, which was written as a devotional book for the pope and was a manual of Christian living for the pope, as this is a manual of Christian living or all Christians. It has been rather difficult for the enemies of Luther to find much fault with this book. The Catholic historians, Janssen and Hergenröther, do not mention it. Grisar characteristically devotes a little space to each of the three great writings of 1520, and considers the book on Christian Liberty as the most mischievous of them all. "It does, indeed, frequently bring its false thoughts in the form of that mystical, heart-searching style which Luther learned from older German models."[5] The French Catholic, Leon Cristiani, is far more generous in his estimate: "A truly religious spirit breathes in these pages. Provoking polemic is almost entirely avoided. Here one finds again the inspiration of the great mystics of the Middle Ages. Does not the 'Imitation' continually describe the powerlessness of man when left to himself, the infinite mercy of God, the great benefit of the redemption of Christ? Does it not preach the necessity of doing all things through love, nothing of necessity? He is not a true Christian who would venture to disapprove the passages in which Luther speaks so eloquently of the goodness of God, of the gratitude which it should inspire in us, of the spontaneity which should mark our obedience, of the desire of imitating Christ which should inspire us."[6]