In case anyone didn't read Matt's explanation of the lyrics, I'd say the key line is "ashes to ashes and dust to dust". This is a biblical line (though it works secularly too) meaning that our physical bodies were formed from dust and ashes and will return thence when we die, so there's no point in making them our primary concern. This ties in with the rest of the song, explaining that since we're all in the same boat, so to speak, we might as well be in it together and show concern for each other.
In case anyone didn't read Matt's explanation of the lyrics, I'd say the key line is "ashes to ashes and dust to dust". This is a biblical line (though it works secularly too) meaning that our physical bodies were formed from dust and ashes and will return thence when we die, so there's no point in making them our primary concern. This ties in with the rest of the song, explaining that since we're all in the same boat, so to speak, we might as well be in it together and show concern for each other.