Date: 1805-6, published 1833-6

"The third faculty Kant finds in reason, to which he advances from the understanding after the same psychological method; that is to say, he hunts through the soul's sack to see what faculties are still to be found there; and thus by merest chance he lights on Reason."

— Hegel, G. W. F. (1770-1831)

Date: 1805-6, published 1833-6

"It would make no difference if there had been no Reason there, just as with physicists it is a matter of perfect indifference whether, for instance, there is such a thing as magnetism or not."

— Hegel, G. W. F. (1770-1831)

Date: 1833, 1840

"The phenomena must be freed once and for all from the grim torture chamber of empiricism, mechanism, and dogmatism; they must be brought before the jury of man's common sense."

— Goethe, Johann Wolfgang (1749-1832)

Date: December 1840

"Perhaps a friendly Morgan le Fay will make Siegfried's castle rise again for me or show my mind's eye what heroic deeds are reserved for his sons of the nineteenth century."

— Engels, Friedrich (1820-1895)

Date: 1841

"It is the solar system of the mind."

— Marx, Karl (1818-1883)

Date: w. btw. April and August, 1844

"Logic -- mind's coin of the realm, the speculative or mental value of man and nature -- its essence which has grown totally indifferent to all real determinateness, and hence unreal -- is alienated thinking, and therefore thinking which abstracts from nature and from real man: abstract thinking."

— Marx, Karl (1818-1883)

Date: December 1843-January 1844

"He freed the body from chains because he enchained the heart."

— Marx, Karl (1818-1883)

Date: December 1843-January 1844

"And once the lightning of thought has squarely struck this ingenuous soil of the people, the emancipation of the Germans into men will be accomplished."

— Marx, Karl (1818-1883)

Date: 1851

When we read, another person thinks for us: we merely repeat his mental process. It is the same as the pupil, in learning to write, following with his pen the lines that have been pencilled by the teacher."

— Schopenhauer, Arthur (1788-1860)

Date: 1851

"But, in reading, our head is, however, really only the arena of some one else’s thoughts."

— Schopenhauer, Arthur (1788-1860)