The words of Bartoluccio stirred the spirit of Lorenzo so greatly, that although Signor Pandolfo, with all his Court and the other painter, kept showing him the greatest favour, Lorenzo took leave of that lord and of the painter, and they, with great unwillingness and displeasure, allowed him to go, neither promises nor increase of payment availing to detain him, since to Lorenzo every hour appeared a thousand years until he could return to Florence. Having departed, therefore, he arrived safely in his own city. Many foreigners had already assembled and presented themselves to the Consuls of the Guild, by whom seven masters were elected out of the whole number, three being Florentines and the others Tuscans; and it was ordained that they should have an allowance of money, and that within a year each man should finish a scene in bronze by way of test, of the same size as those in the first door. And for the subject they chose the story of Abraham sacrificing his son Isaac, wherein they thought that the said masters should be able to show their powers with regard to the difficulties of their art, seeing that this story contained landscapes, figures both nude and clothed, and animals, while the foremost figures could be made in full-relief, the second in half-relief, and the third in low-relief. The competitors for this work were Filippo di Ser Brunellesco, Donato, and Lorenzo di Bartoluccio, all Florentines; Jacopo della Quercia of Siena, and Niccolo d'Arezzo, his pupil; Francesco di Valdambrina; and Simone da Colle, called Simone de' Bronzi. All these men promised before the Consuls that they would deliver their scenes finished within the said time; and each making a beginning with his own, with all zeal and diligence they exerted all their strength and knowledge in order to surpass one another in excellence, keeping their work hidden and most secret, lest they should copy each other's ideas. Lorenzo alone, who had Bartoluccio to guide him and to compel him to labour at many models before they resolved to adopt any one of them--Lorenzo alone was ever inviting the citizens, and sometimes any passing stranger who had some knowledge of the art, to see his work, in order to hear what they thought and these opinions enabled him to execute a model very well wrought and without one defect. And so, when he had made the moulds and cast the work in bronze, it came out very well; whereupon, with his father Bartoluccio, he polished it with such love and patience that nothing could be executed or finished better. And when the time came for comparing the various works, his and those of the other masters were completely finished, and were given to the Guild of Merchants for judgment; but after all had been seen by the Consuls and by many other citizens, diverse opinions were expressed about them. Many foreigners had assembled in Florence, some painters, some sculptors, and others goldsmiths; and they were invited by the Consuls to give judgment on