My practicality consists in this: in the knowledge that if you beat your head against the wall it is your head which breaks and not the wall … that is my strength, my only strength.
Source, in full
quoting a letter to his sister, as reproduced in "Gramsci in Prison: 1926–1937: Introduction" from The Modern Prince and other Writings trans. Louis Marks (London: Lawrence & Wishart, 1957; New York: International Publishers, 1968), p. 56.