“The principles of ethics come from our own nature as social, reasoning beings.”
Source: The Expanding Circle: Ethics, Evolution, and Moral Progress (1981), Chapter 6, A New Understanding Of Ethics, p. 149
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Peter Singer 54
Australian philosopher 1946Related quotes
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Essai sur la théorie de l'économie politique et de ses rapports avec la morale et le droit (1867)

"Why We Are Anti-Semites," August 15, 1920 speech in Munich at the Hofbräuhaus. Speech also known as "Why Are We Anti-Semites?" Translated from Vierteljahrshefte für Zeitgeschichte, 16. Jahrg., 4. H. (Oct., 1968), pp. 390-420. Edited by Carolyn Yeager. https://carolynyeager.net/why-we-are-antisemites-text-adolf-hitlers-1920-speech-hofbr%C3%A4uhaus
1920s

Preface To The 2011 edition, p. xi
The Expanding Circle: Ethics, Evolution, and Moral Progress (1981)

Gakumon no Susume [An Encouragement of Learning] (1872–1876).
Context: Each individual man and each individual country, according to the principles of natural reason, is free from bondage. Consequently, if there is some threat that might infringe upon a country’s freedom, then that country should not hesitate even to take up arms against all the countries of the world.