In my free time I do differential and integral calculus.

Language is as old as consciousness, language is practical, real consciousness that exists for other men as well, and only therefore does it also exist for me; language, like consciousness, only arises from the need, the necessity, of intercourse with other men.

The existence of the state is inseparable from the existence of slavery.

The materialist doctrine that men are products of circumstances and upbringing, and that, therefore, changed men are products of other circumstances and changed upbrinding, forgets that it is men that change circumstances and that the educator himself needs educating.

Let us consider the actual, worldly Jew - not the Sabbath Jew, as Bauer does, but the everyday Jew. ... What is the worldly religion of the Jew? Huckstering. What is his worldly God? Money. Money is the jealous god of Israel, in face of which no other god may exist. Money degrades all the gods of man - and turns them into commodities. The bill of exchange is the real god of the Jew. His god is only an illusory bill of exchange. The chimerical nationality of the Jew is the nationality of the merchant, of the man of money in general.

Religion is the balm of the people.

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