• The sole "property" of matter with whose recognition philosophical materialism is bound up is the property of being an objective reality, of existing outside the mind.

    Vladimir Lenin: The sole "property" of matter with whose recognition philosophical materialism is bound up is the property of being an objective reality, of existing outside the mind.
    "Materialism and Empirio-criticism: Critical Comments on a Reactionary Philosophy (1908)". Book by Vladimir Lenin. Chapter Five: "The Recent Revolution in Natural Science and Philosophical Idealism". Collected Works, Volume 14, www.marxists.org.