I gues the issue hinges on a few things: If we believe that this perceptual world is the ultimate reality, then we must measure good by the observable consequences of certain actions. If we think there's something more, then we have to be content in the understanding that we can never KNOW what good is in a definitive sense, just like we can never draw a perfect circle, for example. Both are ideals. We still have a standard by which to measure a perfect circle because theoretically we can concieve it. The question is can we do so in a decisive way about Good or Goodness? I don't think we can, in the way of some laws that apply to every situation, but I think we can work with our own values to come up with a way of finding out what we will consider good in a given particualr situation. I don't think in this world we'll find an absolute concept of good without qualification, but I do think we can ascertain what we should place value on in this life, and if we value the right things, then we will defend and promote the right things, and we will be doing some good. But i guess the "right things" can be different for different people- some people can do good by being doctors, some people can do good by educating, some by making great art/music for the world to enjoy. So i guess in this world there are many goods, and they all have something in common with the one ultimate good that exists outside this world. But that's just what I think.

Peace