Date: 1767

"These topics will, for the most part, be very extraordinary, and altogether unexpected; but they will constantly produce the intended effect. They will operate upon the mind by surprise; they will strike like lightening, and penetrate the heart at once."

— Duff, William (1732-1815)

Date: 1774

"This activity of imagination, by which it darts with the quickness of lightning, through all possible views of the ideas which are presented, arises from the same perfection of the associating principles, which produces the other qualities of genius."

— Gerard, Alexander (1728-1795)

Date: 1776

"Whatever regards the analysis of the operations of the mind, which is quicker than lightning in all her energies, must in a great measure be abstruse and dark."

— Campbell, George (1719-1796)

Date: 1783

The human body is like a barometer: "If the external air can affect the motions of so heavy a substance as mercury, in the tube of the barometer; we need no wonder, that it should affect those finer fluids, that circulate through the human body."

— Beattie, James (1735-1803)

Date: April, 1783

"I asked him, if he could give me any notion of the situation of our ideas which we have totally forgotten at the time, yet shall afterwards recollect. He paused, meditated a little, and acknowledged his ignorance in the spirit of a philosophical poet, by repeating as a very happy allusion a pass...

— Boswell, James (1740-1795)

Date: April, 1783

"Or it may be thus: his ideas hide themselves like birds in gloomy weather; but in warm sunshine they spring forth gay and airy."

— Boswell, James (1740-1795)

Date: April, 1783

"Let an Hypochondriack then have his park well stocked. Let him get as many agreeable ideas into his mind as he can; and though there may in wintery days seem: a total vacancy, yet when summer glows benignant, and the time of singing of birds is come, he will be delighted with gay colours and enc...

— Boswell, James (1740-1795)

Date: 1783

"The utmost we can expect is, that this fire of imagination should sometimes flash upon us like lightning from heaven, and then disappear."

— Blair, Hugh (1718-1800)

Date: 1785

"I was delighted with this flash bursting from the cloud which hung upon his mind, closed my letter directly, and joined the company."

— Boswell, James (1740-1795)

Date: 1785

"Transient clouds darkened my imagination, and in those clouds I saw events from which I shrunk; but a sentence or two of the Rambler's conversation gave me firmness, and I considered that I was upon an expedition for which I had wished for years, and the recollection of which would be a treasure...

— Boswell, James (1740-1795)