Everything intellectual and transcendent is joined together in painting by the uninterrupted labour of the eyes. Each shade of a flower, a face, a tree, a fruit, a sea, a mountain, is noted eagerly by the intensity of the senses to which is added, in a way of which we are not conscious, the work of the mind, and in the end the strength or weakness of the soul... It is the strength of soul which forces the mind to constant exercise to widen its conception of space. Something of this is perhaps contained in my pictures.

In Max Beckmann – On my Painting, Tate Publishing London, 2003, p. 14 - 'On my painting' (1938)