Makes you proud to be British

[CL]

You can't define it because it's subjective; your idea of white may differ from Nikalas's (for example).

I would say it's the other way round: because you can't define black and white, everything is grey.

If it is subjective then there can't be any grey either. Since human beings are quite capable of distinguishing and defining good from evil it cannot be subjective.

"Captain I can't believe he's dead!"
"Doctor...is this a dead man?"

Sorry I got that from Star-Trek.