.. since then I have found consolation in Blake; 'Without Contraries is no progression', he says in his Proverbs of Hell. And Baudelaire's idea that 'Variety is an essential condition of life' seems to me to be in perfect accord with my aspirations and with my intention, as a Futurist painter, to put life in the place occupied by reasoning in the art of the Cubist period.

p. 247 - after 1960, and posthumous - 'Letters of the great artists', 1963