Lucky: the difference between lonely and being alone

It's beautiful. Alone comes from two words, all-one. It's in the dictionary. 

Death is nothing at all.
It does not count.
I have only slipped away into the next room.
Nothing has happened.

Why should I be out of mind because I am out of sight?
I am but waiting for you, for an interval,
somewhere very near,
just round the corner.