What is good, anyway?

John Jacobson, who i’m connected to on Facebook, recently put up a public screed questioning the concept of good. The person he was responding to, named Brian, originally wrote:

‘If we want to say this is good, then we need a standard by which it can be measured. If you can’t measure it, if you can’t produce the definition … and not just a subjective definition … then “good” does not mean anything.’

Brian put up a response that I can appreciate; I thought it was worth a public response of my own.