We may lay it down as an incontestible axiom, that, in all the operations of art and nature, nothing is created; an equal quantity of matter exists both before and after the experiment; the quality and quantity of the elements remain precisely the same; and nothing takes place beyond changes and modifications in the combination of these elements.
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"The greatest pleasure of the human mind is to discover the truth."
"It is not often that a man has the opportunity to be useful to his fellow citizens without any personal risk."
"I consider nature a vast chemical laboratory, in which all sorts of combinations and decompositions are continually taking place."
"The success of charlatans, sorcerors, and alchemists—and all those who abuse public credulity—is founded on errors in this type of calculation."
"We must trust to nothing but facts, for we are to have no other guide."
From his 'Elements of Chemistry', stating the Law of Conservation of Mass.
Date: 1789
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