
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 109.
Source: Treatise Concerning Eternal and Immutable Morality (1731), Ch. 1, sct. 1
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 109.
Principle attributed to Popper by Ryszard Kapiscinski in New York Times obituary, 1995.
Misattributed
Source: https://www.nytimes.com/1995/01/01/magazine/lives-well-lived-karl-popper-the-philosopher-as-giantslayer.html
Commentarius in Posteriorum Analyticorum Libros (c. 1217-1220)
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 5.
On Practice (1937)
The Four Cardinal Virtues: Prudence, Justice, Fortitude, Temperance (1965)
Un Art de Vivre (The Art of Living) (1939), The Art of Thinking
En anéantissant les désirs, on anéantit l'âme, & tout homme sans passion n'a en lui ni principe d'action, ni motif pour se mouvoir.
A Treatise on Man: His Intellectual Faculties & His Education, Vol. I (1773)
Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 275.