I consider nature a vast chemical laboratory in which all kinds of composition and decompositions are formed.

The chemical and isotopic composition of the sun is the starting composition from which all planets formed.

Dans la nature rien ne se crée, rien ne se perd, tout change.

In nature nothing is created, nothing is lost, everything changes.

Vegetation is the basic instrument the creator uses to set all of nature in motion.

While I thought myself employed only in forming a nomenclature, and while I proposed to myself nothing more than to improve the chemical language, my work transformed itself by degrees, without my being able to prevent it, into a treatise upon the Elements of Chemistry.

We must trust to nothing but facts: these are presented to us by nature and cannot deceive. We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation.