Fair enough, my sentence was poorly phrased. What I meant to say was that the Moon does not have a lot of easily accessible resources useful for human survival. While it has a lot of Oxygen, it is mostly in the form of silicon dioxide, ferrous oxide, magnesium oxide, and aluminum oxide, all of which would require strong processing to reduce. As far as water, the Moon is about as dry as it gets. My favorite quote talking about the Moon's water content goes like this:
This contrasts strongly with the Moon, which is so dry that if concrete were found there, Lunar colonists would mine it to get the water out. - Source
And as far as carbon and nitrogen, they are very minimal. Granted, that info comes from a paper from 1996, and I'm not an expert but that's what I meant!
RE: Why We Should Colonize the Moon before Mars