“Rolling Stone: What was your headspace at the time of Superunknown? A lot of the lyrics are dark.
Cornell: I don't know if I would say I was in a particularly dark or moody headspace more than other times. I feel the lyrics have to be born from the music. Or if I had a lyrical idea, separate from Soundgarden music, I knew if it would work with the band because it tended to reflect what the music was and what the feeling of the music was – which was usually somewhat dark and somber or moody, or over-the-top, visceral, aggressive angry.
Rolling Stone: So it wasn't an especially dark time?
Cornell: No, not that I remember. No more than usual. I think that I always struggled with depression and isolation, so those could come out. I think that the mood of Seattle to me, and the way that I always interpreted that mood was something that was always a little bit introspective and dark. And I wouldn't say "depressing," but introspective in a way that could be moodier and darker.”

Interview with Rolling Stone, 2014 https://www.rollingstone.com/music/features/soundgardens-chris-cornell-on-superunknown-depression-w483113, <br class="br">On depression and suicide