How we cite our quotes: (Chapter.Section.Paragraph) or (Chapter.Paragraph)
Quote #1
As the conscious bearer of this movement, the possessor of money becomes a capitalist. His person, or rather his pocket, is the point from which the money starts, and to which it returns. The objective content of the circulation we have been discussing—the valorization of value—is his subjective purpose, and it is only in so far as the appropriation of ever more wealth in the abstract is the sole driving force behind his operations that he functions as a capitalist, i.e. as capital personified and endowed with consciousness and a will. (4.18)
In Das Kapital, Marx tends to focus on capitalists in terms of the class role they play, not their individual personalities. That's why he speaks of capital as a personified force. Here he says that insofar as capitalists are capitalists, their purpose is to accumulate more and more wealth. It's their class function that Marx is interested in.
Quote #2
For the transformation of money into capital, therefore, the owner of money must find the free worker available on the commodity-market; and this worker must be free in the double sense that as a free individual he can dispose of his labour-power as his own commodity, and that, on the other hand, he has no other commodity for sale, i.e. he is rid of them, he is free of all the objects needed for the realization of his labour-power. (6.6)
Here, Marx is being sarcastic and saying that the working class in capitalism is free—free of the means of production that would otherwise enable them to realize the fruits of their labor. It's the capitalist class that owns the means of production—and that can therefore make the working class sell its labor-power in exchange for pay, the ability to buy the means of sustenance and other commodities.
Quote #3
One thing, however, is clear: nature does not produce on the one hand owners of money or commodities, and on the other hand men possessing nothing but their own labour-power. This relation has no basis in natural history, nor does it have a social basis common to all periods of human history. It is clearly the result of a past historical development, the product of many economic revolutions, of the extinction of a whole series of older formations of social production. (6.7)
The basic class divide throughout history has been between the haves, who control the means of production, and the have-nots, who are forced to produce surplus labor. Under the specific mode of production called capitalism, the have-nots are workers who sell their labor-power and produce both the value of the commodities required to sustain themselves—the necessary labor that must be conducted in all societies—and the surplus-value that the owners of the means of production get to put in their own wallets.