Lyric discussion by crackityj0nes 

I think this line makes the most direct connection to the Bible verse:

"And you were a presence full of light upon this earth And I am a witness to your life and to it's worth"

The "good and faithful servant" has taken what "the master" has given him and increased it, so the Bible verse is meant to encourage us to use our talents, whatever they may be, to make a positive difference in the world. The lyric seems to say that the person John is singing to (his mother-in-law, based on yer_ma's post) has been the good an faithful servant who has used her talent to make the world a better place. Which is about the best thing you can say about someone, when it comes right down to it.

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