Date: 1902

"If it were otherwise, no one could even set down on paper a closely reasoned argument, for the attention would be skipping like a stone hurrying down a sharp incline, or it would be moving hither and thither like a helpless shuttlecock at the mercy of eager players."

— Spiller, Gustav (1864-1940)

Date: 1911

"I shall here have to change my metaphor a little to get the process in his mind. Suppose that instead of your curved pieces of wood you have a springy piece of steel of the same types of curvature as the wood. Now the state of tension or concentration of mind, if he is doing anything really good...

— Hulme, T. E. (1883-1917)

Date: 1999

"On its own this trigger, as we can see from the earlier definition, is not going to generate consciousness. Imagine a candyfloss machine with a stick in the centre that then gathers more and more candyfloss as time goes on. Think of the epicentre as the stick in the centre, the burgeoning candy...

— Greenfield, Susan (b. 1950)

Date: 2001

"Pebble, question, soul: no one can see all sides at once, but there is no side that cannot be seen."

— Richardson, James (b. 1950)

Date: October 28, 2012

"Each grasped, in the unflinching gaze of the other, a silent acknowledgment of the nobility of man, especially as manifested in work, the work that purified the soul the way steel is purified in the smelter. That sort of thing."

— Saunders, George (b. 1958)

Date: 2016

"The plant's radical desire for what has decayed in the soil stands as a figure for memory, the reaching into dark recesses for what used to be alive."

— Wampole, Christy

Date: December 31, 2016

"The human brain didn't evolve like a piece of sedimentary rock, with layers of increasing cognitive sophistication slowly accruing over time."

— Barrett, Lisa Feldman (b. 1963)