“Of all the properties which belong to honorable men, not one is so highly prized as that of character.”
Reported in The Clay Code, or Text-Book of Eloquence, a Collection of Axioms, Apothegms, Sentiments … Gathered from the Public Speeches of Henry Clay, ed. G. Vandenhoff (1844), p. 93.
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Henry Clay 23
American politician from Kentucky 1777–1852Related quotes

As expressed in Galileo's Finger: The Ten Great Ideas of Science (2003) by Peter Atkins, Ch. 10 "Arithmetic : The Limits of Reason", p. 333
Peano axioms
Context: 1. 0 is a number.
2. The immediate successor of a number is also a number.
3. 0 is not the immediate successor of any number.
4. No two numbers have the same immediate successor.
5. Any property belonging to 0 and to the immediate successor of any number that also has that property belongs to all numbers.

“In a society that tries to standardize thinking, individuality is not highly prized”
Attributed

Oration at Plymouth (1802)
Context: Among the sentiments of most powerful operation upon the human heart, and most highly honorable to the human character, are those of veneration for our forefathers, and of love for our posterity. They form the connecting links between the selfish and the social passions. By the fundamental principle of Christianity, the happiness of the individual is Later-woven, by innumerable and imperceptible ties, with that of his contemporaries: by the power of filial reverence and parental affection, individual existence is extended beyond the limits of individual life, and the happiness of every age is chained in mutual dependence upon that of every other.

“It is in the character of very few men to honor without envy a friend who has prospered.”
Source: Oresteia (458 BC), Agamemnon, lines 832–833

As expressed in "The Mathematical Philosophy of Giuseppe Peano" by Hubert C. Kennedy, in Philosophy of Science Vol. 30, No. 3 (July 1963)
Peano axioms

Letter to the General Assembly (1792)

“Water belongs to us all. Nature did not make the sun one person's property, nor air, nor water, cool and clear.”
Usus communis aquarum est.
Nec solem proprium natura nec aera fecit
nec tenues undas
Book VI, 349-351; translation by Michael Simpson https://books.google.ca/books?id=hDPmwbCSSPEC
Metamorphoses (Transformations)