Beyond the shadow of a doubt

So Sabs said something, in the last prayer she prayed.
She said something that included the phrase "beyond the shadow of a doubt".
At some point before, she'd also talked about reassurance from God.
Put together, it reminded me of this old song from my mother's time which I've always loved.

beyond the shadow of a doubt, is how it starts off
as the mighty river flows
as the meadow gently plays
with the wind on summer days

about as deep as deep can go
from the canyons to the sky
like a mother as she cares
for the baby that she bears

do I love you,
don't you know by now?
do I love you,
must I show you how
do I love you,
do I have to say?
do I love you,
yes,
in every way

It doesn't just have to be a love song.
And even if it does,
someone once said that the bible was a collection of love letters from God.