A lot of people seem to lay claim to the “less is more” concept: I see it frequently posted on the web along the lines of, “John Smith explains his ‘less is more’ concept” or even “I explain my ‘less is more’ concept”.
Anyway, I came across this wonderful quote from Seneca the Younger (5BCE-65CE):
It is quality rather than quantity that matters.
The Erratic and Wandering Journey 
Harrumph: I notice he doesn’t say where he got it from either…
😉
Trevor is here all week, folks.
Even if you wish he wasn’t. 😉
(Probably nicked it from the Greeks, who stole from the Babylonians, who had acquired it from…)
… Eve, who first said this to Adam as he revealed the contents of his fig leaf.
(But she was lying, of course.)