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
[download]

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).