It is best to write
with a fountain pen, with ink --
as warm as your blood.
Interview by Jan Brokken with Harry Mulisch, in the Haagse Post, collected in "Schrijven" (1980), and quoted in "Schrijven" (1980), en geciteerd in "Het geheim van de schrijver" ("The writer's secret", 2000, Renate Dorrestein), part 'Love', chapter 'Do you write with a pen or on the computer?'
Collection "Whirligig Scribbler"