The artist is distinguished from all other responsible actors in society—the politicians, legislators, educators, and scientists—by the fact that he is his own test tube, his own laboratory, working according to very rigorous rules, however unstated these may be, and cannot allow any consideration to supersede his responsibility to reveal all that he can possibly discover concerning the mystery of the human being. Society must accept some things as real; but he must always know that visible reality hides a deeper one, and that all our action and achievement rest on things unseen. A society must assume that it is stable, but the artist must know, and he must let us know, that there is nothing stable under heaven. One cannot possibly build a school, teach a child, or drive a car without taking some things for granted. The artist cannot and must not take anything for granted, but must drive to the heart of every answer and expose the question the answer hides.