“Capitalism, in contrast, has existed for fewer than 300 years. If the entire history of Homo sapiens was a 24-hour day, then capitalism has existed for two minutes.”

All Gall Is Divided (1952)

Discussing the seven waves (the invention of speech, the written word, the printing press, newspapers, radio, television, and Internet)
Dalhousie University Commencement Speech (2017)

Source: The Realm of Possibility

Source: 1860s, First State of the Union address (1861)
Context: Labor is prior to and independent of capital. Capital is only the fruit of labor, and could never have existed if labor had not first existed. Labor is the superior of capital, and deserves much the higher consideration. Capital has its rights, which are as worthy of protection as any other rights. Nor is it denied that there is, and probably always will be, a relation between labor and capital producing mutual benefits. The error is in assuming that the whole labor of community exists within that relation.

1910s, The New Nationalism (1910)
Context: It has become entirely clear that we must have government supervision of the capitalization, not only of public-service corporations, including, particularly, railways, but of all corporations doing an interstate business. I do not wish to see the nation forced into the ownership of the railways if it can possibly be avoided, and the only alternative is thoroughgoing and effective legislation, which shall be based on a full knowledge of all the facts, including a physical valuation of property. This physical valuation is not needed, or, at least, is very rarely needed, for fixing rates; but it is needed as the basis of honest capitalization.

Source: The Political Economy Of Growth (1957), Chapter Five, On The Roots Of Backwardness, p. 144

Source: The Limits To Capital (2006 VERSO Edition), Chapter 3, Production, Consumption and Surplus Value, p. 95

Source: The Society of the Spectacle

Early Writings, translated and ed. by , p. 159. https://www.marxists.org/archive/marx/works/1844/epm/3rd.htm
Context: Private property has made us so stupid and one-sided that an object is only ours when we have it, when it exists for us as capital or when we directly possess, eat, drink, wear, inhabit it, etc., in short, when we use it. Although private property conceives all these immediate realizations of possession only as means of life; and the life they serve is the life of private property, labor, and capitalization. Therefore all the physical and intellectual senses have been replaced by the simple estrangement of all these senses – the sense of having. So that it might give birth to its inner wealth, human nature had to be reduced to this absolute poverty.