The fires of these differences had smouldered for some years when, during the University course (as it appears) of 1568-1569, Luis de Leon gave a series of lectures wherein he discussed, with critical respect, the authority attaching to the Vulgate. The respect passed almost unnoticed; the criticism gave a handle to a group of vigilant foes. Since 1569 a good deal of water has flowed under the bridges which span the Tormes, and it is intrinsically likely that, were the objectionable lectures before us, Luis de Leon might appear to be an ultra-conservative in matters of Biblical criticism. But this is not the historical method. In judging the action of Leon de Castro and his allies we must endeavour to adjust ourselves to the sixteenth-century point of view. Matters would seem to have developed somewhat as follows. In 1569 a committee was formed at Salamanca for the purpose of revising François Vatable's version of the Bible; both Luis de Leon and Leon de Castro were members of this committee,[38] and as they represented different schools of thought, there were lively passages between the two. It is customary to lay at Castro's door all the blame for the sequel. Nothing is likelier than that Leon de Castro was incoherent in his recriminations and provocative in tone: it is further alleged that his commentaries on Isaiah contained gratuitous digs at the views on Scriptural interpretation ascribed to Luis de Leon. It may well be that Luis de Leon, who had in him something of the irritability of a poet, took umbrage at these indirect attacks, and entered upon the discussion in a fretful state of mind. According to Leon de Castro, whose testimony on this point is uncontradicted, the climax came about in connexion with the text: 'Out of the mouth of babes and sucklings thou hast perfected praise.' Castro obstinately maintained that Vatable's interpretation of this passage was an interpretation favoured by the Jews against whom he cherished an incorrigible prejudice. Luis de Leon is reported to have lost patience at this assertion, and to have said that he would cause Castro's _Commentaria in Essaiam Prophetam_ to be burnt. Castro, whatever his faults, was not the man to be cowed by a threat, and he retorted with the remark that, by God's grace, this should not come to pass, and that if there were any burning it would be applied rather to Luis de Leon and his family.[39] Having fired his bolt, but conscious that he was in a minority on the committee, Castro concluded with the sulky declaration that he did not propose to attend any further meetings of that body. He would seem to have changed his mind later on this point, modestly alleging that he gave way to the insistence of others who deemed his presence indispensable, on account of his knowledge of languages.[40] Whatever his linguistic accomplishments, they did not produce the desired effect, for Vatable's version of the Bible was