"We aim to make simple things simple and complex things possible"
The original SmalltalkLanguage team didn't completely achieve this goal but to my mind it was the raison d'ĂȘtre of the language and the environment. Isn't this aspiration now carried forward most effectively in mainstream development
-- RichardDrake
This is also one of the repeated refrains of Perl.
See also CouldExtremeProgrammingHaveArisenWithoutSmalltalk and JoshuaSusser who also gives this quote, having worked, like KentBeck, with Kay personally.