Antoine Lavoisier

The whole of chemistry is founded on the principle that the quantity of matter remains constant in all operations.

We must not be afraid to change our opinions when new facts present themselves.

The true method of philosophizing consists in observing facts, and in drawing from them general conclusions.

The more we advance in the knowledge of nature, the more we are convinced that all her operations are governed by immutable laws.

The progress of science depends on the progress of its language.

We must simplify the language of chemistry, and make it more philosophical.

The most important discovery in chemistry is the law of conservation of mass.

It is by the balance that we have been able to establish the true principles of chemistry.

The object of all science is to reduce the number of facts to be observed, by discovering general laws.

We must banish from chemistry all vague and indeterminate expressions.

The revolution in chemistry has been brought about by the introduction of the balance.

The true method of philosophizing consists in observing facts, and in drawing from them general conclusions, which are afterwards verified by new experiments.

We must consider as a general principle that in all chemical operations, the weight of the substances before and after the operation remains the same, or, in other words, that nothing is created, nothing is destroyed, but everything is transformed.

The progress of science is measured by the number of errors it corrects.

The science of chemistry is founded on the principle that the quantity of matter remains constant in all operations, and that nothing is created or destroyed.

It is by the rigorous application of the experimental method that we have been able to make such rapid progress in chemistry.

The object of chemistry is to resolve compound bodies into their constituent parts, and to combine these parts together again, in order to form new compounds.

We must not admit into our theories any hypothesis that is not supported by facts.

The revolution which has taken place in chemistry is due to the introduction of the balance into all our experiments.

The only way to make progress in science is to be constantly questioning our own assumptions.