r366-c017-2
興奮はさせるが,体はまったく動かさないような快楽,たとえば観劇などは,たまにしか与えるべきでない。この種の興奮は,麻薬に似ており,より多量に求められるようになるだろうし,興奮しているときに肉体を少しも動かさないというのは,本能に反する。
Pleasures which are exciting and at the same time involve no physical exertion, such, for example, as the theatre, should occur very rarely. The excitement is in the nature of a drug, of which more and more will come to be required, and the physical passivity during the excitement is contrary to instinct.
From: The Conquest of Happiness, 1930, chap.4:Boredom and excitement
http://russell-j.com/beginner/HA14-060.HTM#r366-c017-2