“The fact that labour is external to the worker, i.e., it does not belong to his intrinsic nature; that in his work, therefore he does not affirm himself but denies himself, does not feel content but unhappy, does not develop freely his physical and mental energy but mortifies his body and his mind. The worker therefore only feels himself outside his work, and in his work feels outside himself.”

The Morals of Confucius http://books.google.pt/books?id=izgCAAAAQAAJ&printsec=frontcover&hl=pt-PT, 2nd edition (London, 1724), Maxim X, p. 114.
Attributed

(describing Marx’s view), p. 49.
Capitalism and Modern Social Theory (1971)

Source: Reverence for Life: The Words of Albert Schweitzer

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 221.

Source: Life Is Worth Living

vol. 1, p. 131
The Nature and Destiny of Man: A Christian Interpretation (1941)

Diary of an Unknown (1988), On Invisibility
Context: Man seeks to escape himself in myth, and does so by any means at his disposal... unnable to withdraw into himself, he disguises himself. Lies and inaccuracy give him a few moments of comfort, the trifling feeling of escape experienced at a masked ball. He distances himself from that which he feels and sees. He invents. He transfigures. He mythifies. He creates. He fancies himself an artist. He imitates, in his small way, the painters he claims are mad.

Notebook VII, The Chapter on Capital, pp. 628–629.
Grundrisse (1857/58)
Context: The development of fixed capital indicates in still another respect the degree of development of wealth generally, or of capital…
The creation of a large quantity of disposable time apart from necessary labour time for society generally and each of its members (i. e. room for the development of the individuals’ full productive forces, hence those of society also), this creation of not-labour time appears in the stage of capital, as of all earlier ones, as not-labour time, free time, for a few. What capital adds is that it increases the surplus labour time of the mass by all the means of art and science, because its wealth consists directly in the appropriation of surplus labour time; since value directly its purpose, not use value. It is thus, despite itself, instrumental in creating the means of social disposable time, in order to reduce labour time for the whole society to a diminishing minimum, and thus to free everyone’s time for their own development. But its tendency always, on the one side, to create disposable time, on the other, to convert it into surplus labour...
The mass of workers must themselves appropriate their own surplus labour. Once they have done so – and disposable time thereby ceases to have an antithetical existence – then, on one side, necessary labour time will be measured by the needs of the social individual, and, on the other, the development of the power of social production will grow so rapidly that, even though production is now calculated for the wealth of all, disposable time will grow for all. For real wealth is the developed productive power of all individuals. The measure of wealth is then not any longer, in any way, labour time, but rather disposable time. Labour time as the measure of value posits wealth itself as founded on poverty, and disposable time as existing in and because of the antithesis to surplus labour time; or, the positing of an individual’s entire time as labour time, and his degradation therefore to mere worker, subsumption under labour. The most developed machinery thus forces the worker to work longer than the savage does, or than he himself did with the simplest, crudest tools.