The free development of each is the condition for the free development of all.

Firstly, the farmers, the most stupid set of people in existence, who, clinging to feudal prejudices, burst forth in masses, ready to die rather than cease to obey those whom they, their fathers and grandfathers, had called their masters; and submitted to be trampled on and horse-whipped by.

Everything must justify its existence before the judgment seat of Reason, or give up existence.

Life is the mode of action of proteins.

But the most horrible spot .... lies....immediately south west of Oxford Road and is known as Little Ireland. The race that lives in these ruinous cottages, behind broken windows, mended with oilskin, sprung doors, and rotten door-posts, or in dark, wet cellars, in measureless filth and stench....must surely have reached the lowest stage of humanity.

Thus at every step we are reminded that we by no means rule over nature like a conqueror over a foreign people, like someone standing outside nature - but that we, with flesh, blood and brain, belong to nature, and exist in its midst, and that all our mastery of it consists in the fact that we have the advantage over all other creatures of being able to learn its laws and apply them correctly.

The first class opposition that appears in history coincides with the development of the antagonism between man and woman in monogamous marriage, and the first class oppression coincides with that of the female sex by the male.