To me, this is a very sad song. The sadness is buried deeply inside
the singer-songwriter's heart, who is, ironically, actually trying
to comfort others.
Based on wiki: "As McLachlan explained on VH1 Storytellers,
the song is about the Smashing Pumpkins touring keyboard player
Jonathan Melvoin, who overdosed on heroin and died in 1996.
McLachlan explained that there's nothing constant when you
are on the road; everything becomes the same."
Or, let's feel this paragraph of lyrics:
In the arms