This inactivity roused the indignation of the officious Prior, who belonged to the vast order of those who believe that the busier a man seems, the more he accomplishes; and so he hastened to the Duke with a remonstrance against the idle painter. The Duke then felt obliged to admonish Leonardo, hinting that he did so merely to oblige the fussy Prior and hoping that Leonardo would understand that the Duke himself had no fault to find with the painter. However, Leonardo was slightly incensed and explained to the understanding Duke that there is a great difference between the work of the creative artist and the stonemason. The creative artist needs time for contemplation; he may be busiest when his hands are idlest. Just now he needed two heads to complete the picture: that of Christ, for which no model on earth could be found, for where was the man to be found whose countenance would express the strength, and beauty, and tenderness, and divine sorrow of the Christ; then he also needed a head for Judas, and that was hard to find also, for where was the man whose face could express the meanness of that base traitor. But he would look no further; if none came his way, he would be satisfied to take the Prior as a model for Judas. This threat silenced the querulous Prior, who quite naturally had no inclination to pass to posterity in such a fashion.