Which you accepted as being the case but not in isolation. Perhaps the phrase is a little ambiguous but unfortunately we don't have Professor Weinberg around for a clarification. I'm guessing that if he'd intended to say that, he'd have included words like "only" or "exclusively" or similar.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
