Nothing is created, either in the operations of art, or in those of nature; and it may be considered as a general principle that in every operation there exists an equal quantity of matter before and after the operation.
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"I have always regarded the study of nature as the most noble and elevated of pursuits."
"Nothing is lost, nothing is created, everything is transformed."
"We must dare to know, and to speak what we know."
"Here, then: a revolution [in science and chemistry] has taken place in an important part of human knowledge since your departure from Europe… I will consider this revolution to be well advanced and ev…"
"The scientist should be a judge, not an advocate."
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Matter cannot appear from nothing or vanish into nothing. Whether humans are performing a chemical procedure or nature is running its own processes, the total amount of stuff stays the same before and after. Things change form, combine, or break apart, but the underlying quantity of material is always conserved. This is the core idea of what we now call the law of conservation of mass.
Lavoisier built modern chemistry on exactly this principle. By weighing reactants and products on precise balances, he overturned phlogiston theory and showed combustion was oxygen combining with matter, not a mystery substance escaping. His meticulous quantitative experiments, recorded with his wife Marie-Anne, made mass conservation the bedrock of chemical analysis. This quote distills his lifelong conviction that chemistry must be a rigorous, measurable science grounded in the bookkeeping of matter.
In the late 1700s, chemistry was emerging from alchemy into a quantitative discipline. Phlogiston theory dominated until Lavoisier's experiments displaced it. The Enlightenment prized measurement, reason, and systematic classification, and Lavoisier helped reform chemical nomenclature alongside Fourcroy and Berthollet. He worked as a tax collector for the Ferme generale, which funded his lab but cost him his life at the guillotine in 1794 during the Reign of Terror of the French Revolution.
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