Leonardo imagined, and has succeeded in expressing, the desire that has entered the minds of the apostles to know who is betraying their Master. So in the face of each one may be seen love, fear, indignation, or grief at not being able to understand the meaning of Christ; and this excites no less astonishment than the obstinate hatred and treachery to be seen in Judas." (Georgio Vasari, Lives of the Artists, 1568; translated by George Bull)