The day has passed for patching up the capitalist system; it must go. And in the work of abolishing it the Catholic and the Protestant, the Catholic and the Jew, the Catholic and the Freethinker, the Catholic and the Buddhist, the Catholic and the Mahometan will co- operate together† For, as we have said elsewhere, Socialism is neither Protestant nor Catholic,Christian norFreethinker,Buddhist,Mahometan, nor Jew; it isonly HUMAN.

-Connolly,James
  Labour, Nationality, and Religion.

The worker is the slave of capitalist society, the female worker is the slave of that slave.

-Connolly,James
  The Re-conquest of Ireland.

If there are indeed any iron laws of history, one of them is surely that in any major crisis of the capitalist system, a sector of the liberal middle class will shift to the left, and then shift smartly back again once the crisis has blown over.

-Eagleton,Terry
  In the London Review of Books, 2 Dec.

Igreet you as the advanceguard of the world proletarian army. The hour is not far off when†the German people will turn their weapons againsttheircapitalist exploiters. The sun of the socialist revolution has already risen.

-Lenin,Vladimir Ilyich originally Vladimir IlyichUlyanov
  Speech, Petrograd,16  Apr.

   If capital isgrowing rapidly, wages may rise; the profit of capital rises incomparably more rapidly. The material position of the worker has improved, but at the cost of his social position. The social gulf that divides him from the capitalist has widened.

-Marx, Karl Heinrich
  'Wage Labour and Capital', collected in Robert C  Tucker (ed)  The Marx^Engels Reader (2nd edn,1972), p.211.

  The production of surplus-value, or the extraction of surplus labour, is the specific end and aim, the sum and 558 substance, of capitalist production.

-Marx, Karl Heinrich
  Das Kapital.

The socialist society would have to forbid capitalist acts between consenting adults.

-Nozick, Robert
  Anarchy, State, and Utopia, p.163.

Queen Elizabeth owned silk stockings. The capitalist achievement does not typically consist in providing more silk stockings for queens but in bringing them within the reach of factory girls in return for steadily decreasing amount of effort.

-Schumpeter,Joseph Alois
  Capitalism, Socialism, and Democracy, p.67.