Date: 1820

"And they [Stewart, Tracy, Cabanis] ask why may not the mode of action called thought, have been given to a material organ of peculiar structure, as that of magnetism is to the needle, or of elasticity to the spring by a particular manipulation of the steel."

— Jefferson, Thomas (1743-1826)

Date: 1820

"When I meet with a proposition beyond finite comprehension, I abandon it as I do a weight which human strength cannot lift, and I think ignorance, in these cases, is truly the softest pillow on which I can lay my head."

— Jefferson, Thomas (1743-1826)

Date: August 16, 1820

"And is not this extraordina[r]y talk for the writer of Endymion? whose mind was like a pack of scattered cards--I am pick'd up and sorted to a pip."

— Keats, John (1795-1821)

Date: August 16, 1820

"My Imagination is a Monastery and I am its Monk--you must explain my metap^cs to yourself."

— Keats, John (1795-1821)

Date: December 27, 1823

"Now in filling my mind with them [ideas and facts], and in warming and animating me, you would, I doubt not, do me great good. And I am one of those substances, like sealing wax and other electric bodies, which require to be warmed in order to possess the faculty of attracting objects, of coveri...

— Wilberforce, William (1759-1833)

Date: January 8, 1824

"The string you touched in your last truly kind letter has been vibrating ever since, and making music most delightful to a parent's mental ear; an organ not commonly noticed, but which is full as much in daily exercise as the mind's eye of which we speak so familiarly."

— Wilberforce, William (1759-1833)

Date: June 19, 1834

"I know my own sentiments, because I can read my own mind, but the minds of the rest of man and woman-kind are to me as sealed volumes, hieroglyphical scrolls, which I can not easily unseal or decipher."

— Brontë, Charlotte (1816-1855)

Date: June 19, 1834

"How many after having, as they thought, discovered the word friend in the mental volume, have afterwards found that they have read false friend!"

— Brontë, Charlotte (1816-1855)

Date: June 19, 1834

"I have long seen 'friend' in your mind, in your words and actions, but now distinctly visible, and clearly written in characters that cannot be distrusted, I discern true friend."

— Brontë, Charlotte (1816-1855)

Date: September, 1838

"The tree of my mind of its leaves is stripped, my witticisms too fine are clipped, the kernel out of the shell has been nipped."

— Engels, Friedrich (1820-1895)