Quotes from book
Economic and Philosophic Manuscripts of 1844
Economic and Philosophic Manuscripts of 1844 are a series of notes written between April and August 1844 by Karl Marx. Not published by Marx during his lifetime, they were first released in 1932 by researchers in the Soviet Union.

Critique of the Hegelian Dialectic and Philosophy as a Whole, p. 64.
Paris Manuscripts (1844)
Context: Feuerbach is the only one who has a serious, critical attitude to the Hegelian dialectic and who has made genuine discoveries in this field. He is in fact the true conqueror of the old philosophy. The extent of his achievement, and the unpretentious simplicity with which he, Feuerbach, gives it to the world, stand in striking contrast to the opposite attitude (of the others). Feuerbach’s great achievement is: (1) The proof that philosophy is nothing else but religion rendered into thought and expounded by thought, i. e., another form and manner of existence of the estrangement of the essence of man; hence equally to be condemned;(2) The establishment of true materialism and of real science, by making the social relationship of “man to man” the basic principle of the theory; (3) His opposing of the negation of the negation, which claims to be the absolute positive, the self-supporting positive, positively based on itself.

First Manuscript – Wages of Labour, p. 6.
Paris Manuscripts (1844)
Context: Political Economy regards the proletarian … like a horse, he must receive enough to enable him to work. It does not consider him, during the time when he is not working, as a human being. It leaves this to criminal law, doctors, religion, statistical tables, politics, and the beadle. … (1) What is the meaning, in the development of mankind, of this reduction of the greater part of mankind to abstract labor? (2) What mistakes are made by the piecemeal reformers, who either want to raise wages and thereby improve the situation of the working class, or — like Proudhon — see equality of wages as the goal of social revolution?.

“The worker therefore only feels himself outside his work, and in his work feels outside himself”
Estranged Labour, p. 30.
Paris Manuscripts (1844)
Context: 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.