Date: 1761

"It is not the soft power of humanity, it is not that feeble spark of benevolence which Nature has lighted up in the human heart, that is thus capable of counteracting the strongest impluses of self-love."

— Smith, Adam (1723-1790)

Date: 1765

"Modern philosophers give them other fine names and Julius Scaliger, in particular, used to call them "seeds of eternity" and also "zopyra"--meaning living fires or flashes of light hidden inside us but made visible by stimulation of the senses, as sparks can be struck by steel."

— Leibniz, Gottfried Wilhelm (1646-1716)

Date: 1777

"If I may be allowed to change the allusion so soon, I would say, that the passions also resemble fires, which are friendly and beneficial when under proper direction, but if suffered to blaze without restraint, they carry devastation along with them, and, if totally extinguished, leave the benig...

— More, Hannah (1745-1833)

Date: 1782

"I read it carefully a second time--pondered--weighed--and submitted--whenever a spark of vanity seems to be glowing at my heart--I will read your letter--and what then?"

— Sancho, Charles Ignatius (1729-1780)

Date: January 19, 1791

"You know them but at a distance, on the statements of those who always flatter the reigning power, and who, amidst their representations of the grievances, inflame your minds against those who are oppressed. These are amongst the effects of unremitted labour, when men exhaust their attention, bu...

— Burke, Edmund (1729-1797)