Grundrisse

Surplus value in general is value in excess of the equivalent. The great historic quality of capital is to create this surplus labour, superfluous labour from the standpoint of mere use value, mere subsistence; and its historic destiny (Bestimmung) is fulfilled as soon as, on one side, there has been such a development of needs that surplus labour above and beyond necessity has itself become a general need arising out of individual needs themselves - and on the other side, when the severe discipline of capital, acting on succeeding generations (Geschlechter), has developed general industriousness as the general property of the new species (Geschlecht) and, finally, when the development of the productive powers of labour, which capital incessantly whips onward with its unlimited mania for wealth, and of the sole conditions in which this mania can be realized, have flourished to the stage where the possession and preservation of general wealth require a lesser labour time of society as a whole, and where the labouring society relates scientifically to the process of its progressive reproduction, its reproduction in a constantly greater abundance; hence where labour in which a human being does what a thing could do has ceased. Accordingly, capital and labour relate to each other here like money and commodity; the former is the general form of wealth, the other only the substance destined for immediate consumption.

Karl Marx

1818 - 1883