Psycho-history was the quintessence of sociology, it was the science of human behavior reduced to mathematical equations.
Asimov, Isaac
Foundation 3 - Second Foundation
He knew what would happen if he drank this spice drug with its quintessence of the substance that brought the change onto him.
Herbert, Frank
Dune
There lay the essence and quintessence of the Parisian white society.
Victor Hugo
Les Misérables
I haven’t done anything wrong.” Harry did not answer, but pretended to be absorbed in the book they were supposed to have read before Charms next morning (Quintessence: A Quest).
J. K. Rowling
Harry Potter and the Half-Blood Prince
“ ‘Let there be light!’ said God; and forthwith light Ethereal, first of things, quintessence pure, Sprung from the Deep, and from her native east To journey through the aery gloom began, Sphered in a radiant cloud, for yet the sun Was not; she in a cloudy tabernacle Sojourned the while.
John Milton
Paradise Lost
They then posted themselves on the level ground at the outlet of the Sierra, and as soon as Don Quixote and his companions emerged from it the curate began to examine him very deliberately, as though he were striving to recognise him, and after having stared at him for some time he hastened towards him with open arms exclaiming, “A happy meeting with the mirror of chivalry, my worthy compatriot Don Quixote of La Mancha, the flower and cream of high breeding, the protection and relief of the distressed, the quintessence of knights-errant!” And so saying he clasped in his arms the knee of Don Quixote’s left leg.
Miguel de Cervantes Saavedra
Don Quixote