Pliny the Elder Quote

Most Men are ignorant of that Secret which, by great Study of the Heavens, Men of deep Learning have found out: namely, that it is the Fires of uppermost Planets, which, falling to the Earth, carry the Name of Lightnings.

Pliny's Natural History. In Thirty-seven Books, Book II, Chapter XX (p. 58), Printed for the Club by G. Barclay. 1847-1849