A man cannot become a child again, or he becomes childish.

Bourgeois society ought long ago to have gone to the dogs through sheer idleness; for those of its members who work, acquire nothing, and those who acquire anything, do not work.

We know only a single science, the science of history. History can be contemplated from two sides, it can be divided into the history of nature and the history of mankind. However, the two sides are not to be divided off; as long as men exist the history of nature and the history of men are mutually conditioned.

The criticism of Religion is the beginning of all criticism

All history is nothing but a continuous transformation of human nature.

All forms of the state have democracy for their truth, and for that reason are false to the extent that they are not democracy

Surplus-value and the rate of surplus-value are... the invisible essence to be investigated, whereas the rate of profit and hence the form of surplus-value as profit are visible surface phenomena