I've read this a couple of times, and I'm not really sure what Gonzalez was saying. It must be said that I don't trust the man. But it's true: the Constitution doesn't GRANT rights. They are "inalienable rights" given to all men by God, and the Constitution says they cannot be taken away.
The right to life. Freedom of religion. The right of self defense. The right to liberty. The right to the pursuit of happiness.
The Declaration of Independence, which I think can rightly be considered a preamble to the constitution, specifically mentions three of these inalienable rights. But the right to bear arms, for example, although granted by the Constitution, depends in turn on the natural right of self defense. Thankfully, the writers of the Constitution were familiar with the natural law tradition as well as the teaching of Christianity.
Exactly what Gonzalez is trying to say here, I don't know. I do know that I don't want him on the Supreme Court.
(Of course, that never stopped some people. There have been some real dullards and some totally unsuited temperamentally . . . )