Principles of Modern Chemistry (7th ed., 2012), Ch. 2 : Chemical Formulas, Equations, and Reaction Yields
“Cellular pathology is not an end if one cannot see any alteration in the cell. Chemistry brings the clarification of living processes nearer than does anatomy. Each anatomical change must have been preceded by a chemical one.”
attributed to Rudolph Virchow Coper, H., Herken, H., 1963. Dtsch. Med. Wochenschr. 88,2025– 2036. cited by 1. Gelman BB, Soukup VM, Schuenke KW, Keherly MJ, Holzer C, Richey FJ, et al. Acquired neuronal channelopathies in HIV-associated dementia. J Neuroimmunol. 2004;157(1–2 SPEC. ISS.):111–9.
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Rudolf Virchow 8
German doctor, anthropologist, public health activist, path… 1821–1902Related quotes
As quoted in "Independence Day: Bollywood stars wish peace, progress, prosperity" in The Times of India (15 August 2014) http://timesofindia.indiatimes.com/entertainment/hindi/bollywood/news/Independence-Day-Bollywood-stars-wish-peace-progress-prosperity/articleshow/40306133.cms.
Context: Change cannot come from one politician, it has to come from each one of us and not just for today... it's a gradual process. Let's be responsible & work towards it.
Principles of Biochemistry, Ch. 1 : The Foundations of Biochemistry

Source: 1960s, The Gutenberg Galaxy (1962), p. 28

Jöns Jacob Berzelius, Essai sur le théorie des proportions chimiques (1819). Translated in Henry M. Leicester and Herbert S. Klickstein, A Source Book in Chemistry 1400-1900 (1952), 260.

Source: The Monkey Grammarian (1974), Ch. 2
Context: Fixity is always momentary. It is an equilibrium, at once precarious and perfect, that lasts the space of an instant: a flickering of the light, the appearance of a cloud, or a slight change in temperature is enough to break the repose-pact and unleash the series of metamorphoses. Each metamorphosis, in turn, is another moment of fixity succeeded by another change and another unexpected equilibrium. No one is alone, and each change here brings about another change there. No one is alone and nothing is solid: change is comprised of fixities that are momentary accords.

Source: Process charts (1921), p. 3.

Quote (1908), # 840, in The Diaries of Paul Klee, translation: Pierre B. Schneider, R. Y. Zachary and Max Knight; publisher, University of California Press, 1964
1903 - 1910