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The following are quotes by Nernst:
- “Since every chemical process, like every process of nature, can only advance without the introduction of external energy only in the sense in which it can perform work; and since also for a measure of the chemical affinity, we must presuppose the absolute condition, that every process must complete itself in the sense of the affinity—on this basis we me may without suspicion regard the maximal external work of a chemical process (i.e. the change of free energy), as the measure of affinity. Therefore the clearly defined problem of thermo-chemistry is to measure the amounts of the changes of free energy associated with chemical processes, with the greatest accuracy possible … when this problem shall be solved, then it will be possible to predict whether or not a reaction can complete itself under the respective conditions. All reactions advance only in the sense of a diminution of free energy, i.e. only in the sense of the affinity.”
- — Walther Nernst (1893), Theoretical Chemistry: from the Standpoint of Avogadro’s Rule and Thermodynamics (pg. 692)
- “I have already been to heaven. It was quite nice there, but I told them they could have it even better.”
- — Walther Nernst (1941), “last words”, told to his wife Emma 
- Nernst, Walther. (1893). Theoretical Chemistry: from the Standpoint of Avogadro’s Rule and Thermodynamics (§: Measure of Affinity, pgs. 586-88, quote, pg. 692). MacMillan, 1895.
- Cropper, William H. (2004). Great Physicists: the Life and Times of Leading Physicists from Galileo to Hawking (§10: Walther Nernst, pgs. 124-33; last words, pg. 133). Oxford University Press.
- Nernst, Walther. (1893). Theoretical Chemistry: from the Standpoint of Avogadro’s Rule and Thermodynamics. MacMillan, 1895
- Walther Nernst – Hmolpedia 2020.