“The sum of the rivals is constant.”

— Carole Morin

Lampshades (1991)

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Carole Morin23

British writer

Anatol Rapoport (1911–2007) Russian-born American mathematical psychologist

Anatol Rapoport. (1974). Game Theory as a Theory of Conflict Resolution p. 4
1970s and later

“I will not say with Lord Hale, that "the law will admit of no rival, and nothing to go even with it;" but I will say, that it is a jealous mistress, and requires a long and constant courtship. It is not to be won by trifling favours, but by a lavish homage.”

Joseph Story (1779–1845) US Supreme Court justice

A Discourse Pronounced upon the Inauguration of the Author, as Dane Professor of Law in Harvard University on the Twenty-fifth Day of August, 1829 (1829), p. 29.

“No species remains constant: that great renovator of matter
Nature, endlessly fashions new forms from old: there’s nothing
in the whole universe that perishes, believe me; rather
it renews and varies its substance. What we describe as birth
is no more than incipient change from a prior state, while dying
is merely to quit it. Though the parts may be transported
hither and thither, the sum of all matter is constant.”
Nec species sua cuique manet, rerumque novatrix ex aliis alias reparat natura figuras: nec perit in toto quicquam, mihi credite, mundo, sed variat faciemque novat, nascique vocatur incipere esse aliud, quam quod fuit ante, morique desinere illud idem. cum sint huc forsitan illa, haec translata illuc, summa tamen omnia constant.

Ovid Metamorphoses

Nec species sua cuique manet, rerumque novatrix
ex aliis alias reparat natura figuras:
nec perit in toto quicquam, mihi credite, mundo,
sed variat faciemque novat, nascique vocatur
incipere esse aliud, quam quod fuit ante, morique
desinere illud idem. cum sint huc forsitan illa,
haec translata illuc, summa tamen omnia constant.
Book XV, 252–258 (as translated by Peter Green)
Metamorphoses (Transformations)

“The new race or species may not be absolutely superior in the sum of its powers and endowment to the parent stock, and may even be more simple in structure and of a lower grade of intelligence, as well as of organisation, provided, on the whole, it happens to have some slight advantage over its rivals. Progression, therefore, is not a necessary accompaniment of variation and natural selection”

Charles Lyell (1797–1875) British lawyer and geologist

Source: The Geological Evidences of the Antiquity of Man (1863), Ch.21, p. 411-412
Context: The competition of races and species, observes Mr. Darwin, is always most severe between those which are most closely allied and which fill nearly the same place in the economy of nature. Hence, when the conditions of existence are modified, the original stock runs great risk of being superseded by some one of its modified offshoots. The new race or species may not be absolutely superior in the sum of its powers and endowment to the parent stock, and may even be more simple in structure and of a lower grade of intelligence, as well as of organisation, provided, on the whole, it happens to have some slight advantage over its rivals. Progression, therefore, is not a necessary accompaniment of variation and natural selection, though, when a higher organisation happens to be coincident with superior fitness to new conditions, the new species will have greater power and a greater chance of permanently maintaining and extending its ground.