Antoine Lavoisier - Traité Élémentaire de Chimie (1789)

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If, by the term elements, we mean to express the simple and indivisible molecules that compose bodies, it is probable that we know nothing about them; but if, on the contrary, we express by the term elements or principles of bodies the idea of the last point reached by analysis, all substances that we have not yet been able to decompose by any means are elements to us.

Antoine Lavoisier