In terminology, think refers to the process of working the mind on problems.

The following are related quotes:

Freethinkers are those who are willing to use their minds without prejudice and without fearing to understand things that clash with their own customs, privileges, or beliefs. This state of mind is not common, but it is essential for right thinking.”
Leo Tolstoy (1862), War and Peace (Ѻ)

“I, too, was originally supposed to become an engineer. But I found the idea intolerable of having to apply the inventive faculty to matters that make everyday life more elaborate—and all, just for dreary money-making. Thinking for its own sake, as in music! … When I have no special problem to occupy my mind, I love to reconstruct proofs of mathematical and physical theorems that have long been known to me. There is no goal in this, merely an opportunity to indulge in the pleasant occupation of thinking.”
Albert Einstein (1918), "Letter to Heinrich Zangger"

“Here stood a man entirely on his own. There was no Medici family to put resources at his disposal. Scientifically, he was in a less favorable situation than the members of the Florentine Academia del Cimento who could advise each other. He had to think out for himself every little artifact and design emery piece of auxiliary apparatus so that it could be made by a Magdeburg based business. Perhaps it is this that is at the root of the preference, that all his experiments show, for a certain unsophisticated directness. When someone in Florence carried out experiments on the pressure of the air, he could rely on the availability of the highest technical expertise. Here in Magdeburg, the equipment for scientific research was the solid and durable work of a local forge. While this, on the one hand, made it harder to perform experiments it also, on the other, gave them an overwhelming direct impact.”
Hans Schimank (1936), Otto von Guericke (pg. 40)

History is hard to know, because of all the hired bullsh*t, but even without being sure of 'history' it seems entirely reasonable to think that every now and then the energy of a whole generation comes to a head in a long fine flash, for reasons that nobody really understands at the time—and which never explain, in retrospect, what actually happened . . . There was madness in any direction, at any hour. If not across the Bay, then up the Golden Gate or down 101 to Los Altos or La Honda . . . You could strike sparks anywhere. There was a fantastic universal sense that whatever we were doing was right, that we were winning . . . And that, I think, was the handle—that sense of inevitable victory over the forces of Old and Evil. Not in any mean or military sense; we didn't need that. Our energy would simply prevail. There was no point in fighting—on our side or theirs. We had all the momentum; we were riding the crest of a high and beautiful wave . . . So now, less than five years later, you can go up on a steep hill in Las Vegas and look West, and with the right kind of eyes you can almost see the high-water mark—that place where the wave finally broke and rolled back.”
Hunter Thompson (1971), Fear and Loathing in Las Vegas [2]

See also
● Thinker

1. (a) Schimank, Hans. (1936). Otto von Guericke: Mayer of Magdeburg – a German Statesman, Thinker, and Researcher (Otto von Guericke: Burgermeister von Magdeburg. Ein deutscher Staatsman, Denker und Forscher) (one his own, pg. 40; name change, pg. 69). Publisher.
(b) Conlon, Thomas. (2011). Thinking About Nothing: Otto von Guericke and the Magdeburg Experiments on the Vacuum (Amz) (on his own, pg. 44). Saint Austin Press/LuLu.
2. Hunter S. Thompson – Wikipedia.

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