Date: 1851

"Indeed, it is the same with mental as with bodily food: scarcely the fifth part of what a man takes is assimilated; the remainder passes off in evaporation, respiration, and the like."

— Schopenhauer, Arthur (1788-1860)

Date: 1851

"The largest library in disorder is not so useful as a smaller but orderly one; in the same way the greatest amount of knowledge, if it has not been worked out in one’s own mind, is of less value than a much smaller amount that has been fully considered."

— Schopenhauer, Arthur (1788-1860)

Date: September 20, 1858

"The news of the new treaty wrung from China by the allied Plenipotentiaries has, it would appear, conjured up the same wild vistas of an immense extension of trade which danced before the eyes of the commercial mind in 1845, after the conclusion of the first Chinese war."

— Marx, Karl (1818-1883)

Date: August 6 and 20, 1859

"The jaded cart-horse of the commonplace bourgeois mind falters of course in confusion in front of the ditch separating substance from appearance, and cause from effect; but one should not ride carthorses if one intends to go coursing over the very rough ground of abstract reasoning."

— Engels, Friedrich (1820-1895)

Date: February 14, 1860

"But, in England, it is some subaltern spokesman, some worn-out place-hunter, some anonymous nonentity of a so-called Cabinet, that, relying on the donkey power of the Parliamentary mind and the bewildering evaporations of an anonymous press, without making any noise, without incurring any danger...

— Marx, Karl (1818-1883)

Date: 1867

"As the hart pants after fresh water, so pants his soul after money, the only wealth."

— Marx, Karl (1818-1883)

Date: 1867

"As capitalist, he is only capital personified. His soul is the soul of capital."

— Marx, Karl (1818-1883)

Date: 1871

"The police-tinged bourgeois mind naturally figures to itself the International Working Men's Association as acting in the manner of a secret conspiracy, its central body ordering, from time to time, explosions in different countries."

— Marx, Karl (1818-1883)

Date: 1878

"All religion, however, is nothing but the fantastic reflection in men's minds of those external forces which control their daily life, a reflection in which the terrestrial forces assume the form of supernatural forces."

— Engels, Friedrich (1820-1895)