The function of the artist is to disturb. His duty is to arouse the sleeper, to shake the complacent pillars of the world. He reminds the world of its dark ancestry, and shows the world its present and points the way to its new birth. He is at once the product and preceptor of his times.
1937 Letter from Madrid, 5 May. Quoted in Ted Allen and Sydney Gordon The Scalpel, The S word (1952).