Quotes from book
Principia Ethica

Name: Principia Ethica
Author: G. E. Moore

Principia Ethica is a 1903 book by the British philosopher G. E. Moore, in which the author insists on the indefinability of "good" and provides an exposition of the naturalistic fallacy. Principia Ethica was influential, and Moore's arguments were long regarded as path-breaking advances in moral philosophy, though they have been seen as less impressive and durable than his contributions in other fields.

“By far the most valuable things, which we know or can imagine, are certain states of consciousness, which may roughly be described as the pleasures of human intercourse and the enjoyment of beautiful objects. No one, probably, who has asked himself the question, has ever doubted that personal affection and the appreciation of what is beautiful in Art or Nature, are good in themselves; nor, if we consider strictly what things are worth having purely for their own sakes, does it appear probable that any one will think that anything else has nearly so much value as the things which are included under these two heads.”

G. E. Moore book Principia Ethica

Principia Ethica (1903; revised edition, Cambridge University Press, 1993).