Date: 1922

"When the two gases previously mentioned are mixed in the presence of a filament of platinum, they form sulphurous acid. This combination takes place only if the platinum is present; nevertheless the newly formed acid contains no trace of platinum, and the platinum itself is apparently unaffected...

— Eliot, T. S. (1888-1965)

Date: November 11, 1967

"Because suddenly, from a height of thousands of centuries, the first stone of an avalanche came tumbling down: it was my heart."

— Lispector, Clarice (1920-1977)

Date: February 8, 1996

"These laws would declare ideas to be another industrial product, no more noble than pig iron."

— Barlow, John Perry (b. 1947)

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: 1999

"Perhaps the consciousness of dreaming is the almost random formation of little groups forming in different configurations like pebbles thrown very gently into the water. One can imagine the gentle ripples easily being displaced by the next pebble as it hits the water."

— 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: 2006

"When there is no longer any wobble, then the mind is like an unwavering rock, more immovable than a mountain and harder than a diamond."

— Ajahn Brahm [born Peter Betts] (August 7, 1951)

Date: February 25, 2010

"This suggests that depressive disorder is an extreme form of an ordinary thought process, part of the dismal machinery that draws us toward our problems, like a magnet to metal."

— Lehrer, Jonah

Date: March 11, 2011

"Given the limits of steel and concrete to resist the forces of nature, much depends on people’s own preparedness to face up to disaster -- but that mental infrastructure is in even poorer shape than the nation’s roads and bridges."

— Schwartz, John

Date: 2011

"Marx, his mind as hard and brilliant as a diamond, knew he would emerge the victor in any battle of wits."

— Gabriel, Mary