It is not meant to be run since it doesn't output anything. However, it does run even with use strict;
If you remove the our it reads something like this:
The greatest person -- God
The greatest devotion -- so loved
The greatest number -- the world
The greatest act -- He gave
The greatest gift -- His only begotten Son
The greatest condition -- that whosoever believeth in Him
The greatest mercy -- should not perish
The greatest result -- have everlasting life
The greatest verse -- John 3:16
It's an adaptation of a meditation that I found in my Bible last night. It just made sense to stuff that into a hash to somewhat preserve the original ("unknown") author's work (which had the text of the verse on the left instead of on the right of the dashes).