Full Idea
The beautiful should be defined as that of which the admiring contemplation is good in itself.
Gist of Idea
The beautiful is whatever it is intrinsically good to admire
Source
G.E. Moore (Principia Ethica [1903], p.210), quoted by Graham Farmelo - The Strangest Man
Book Reference
Farmelo,Graham: 'The Strangest Man [Paul Dirac]' [Faber 2009], p.74
A Reaction
To work, this definition must exclude anything else which it is intrinsically good to admire. Good deeds obviously qualify for that, so good deeds must be intrinsically beautiful (which would be agreed by ancient Greeks). We can't ask WHY it is good!