“The purely selfish happiness of certain Epicureans is a chimera, an abstraction, an impossibility; the true human pleasures are all more or less social. Pure egoism, rather than being an affirmation of the self, is a mutilation of the self.”
Outline of a Morality Without Obligation or Sanction https://www.marxists.org/archive/guyau/1885/morality.htm (1885).
Context: A third equivalent of duty is borrowed from sensibility and not, like the preceding, from intelligence and activity. It’s the growing fusion of sensibilities, and the ever increasing sociable character of elevated pleasures, from which results a kind of duty or superior necessity which pushes us naturally and rationally towards others. By virtue of evolution, our pleasures grow and become increasingly impersonal; we cannot experience enjoyment within our selves as if on a deserted isle. Our milieu, to which we better adapt ourselves every day, is human society, and we can no more be happy outside of this milieu than we can breathe outside the air. The purely selfish happiness of certain Epicureans is a chimera, an abstraction, an impossibility; the true human pleasures are all more or less social. Pure egoism, rather than being an affirmation of the self, is a mutilation of the self.
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Jean-Marie Guyau 4
French writer and philosopher 1854–1888Related quotes
Knowing Yourself: The True in the False (1996)

Introduction to Capital. Introduction to volume 1 (1976)

Academy of Achievement Address, published by Corporate Valley (12 August 2013) https://www.youtube.com/watch?v=54xWQPq0fuk
2010s

1850s, Judge For Yourselves! 1851 (1876)

“We humans may be released into a realm of pure self-engineering. The imagination is everything.”
"New Maps of Hyperspace" (1989); originally published in Magical Blend magazine, also in The Archaic Revival: Speculations on Psychedelic Mushrooms, the Amazon, Virtual Reality, UFOs, Evolution, Shamanism, the Rebirth of the Goddess, and the End of History (1992) http://www.erowid.org/culture/characters/mckenna_terence/mckenna_terence_maps_hyperspace.shtml
Context: There is a spiritual obligation, there is a task to be done. It is not, however, something as simple as following a set of somebody else's rules. The noetic enterprise is a primary obligation toward being. Our salvation is linked to it. Not everyone has to read alchemical texts or study superconducting biomolecules to make the transition. Most people make it naively by thinking clearly about the present at hand, but we intellectuals are trapped in a world of too much information. Innocence is gone for us. We cannot expect to cross the rainbow bridge through a good act of contrition; that will not be sufficient.
We have to understand. Whitehead said, "Understanding is the apperception of pattern as such"; to fear death is to misunderstand life. Cognitive activity is the defining act of humanness. Language, thought, analysis, art, dance, poetry, mythmaking: these are the things that point the way toward the realm of the eschaton. We humans may be released into a realm of pure self-engineering. The imagination is everything. This was Blake's perception. This is where we came from. This is where we are going. And it is only to be approached through cognitive activity.

Preface (1910) to The Bible of Amiens by John Ruskin, translated by Proust (1904); from Marcel Proust: On Reading Ruskin, trans. Jean Autret and Philip J. Wolfe (Yale University Press, 1987, ISBN 0-300-04503-4, p. 53