All final spiritual reference is to be the silence beyond sound. The word made flesh is the first sound. Beyond that sound is the transcendent unknown, the unknowable. It can be spoken of as the great silence, or as the void, or as the transcendent absolute.
One dark night
fired by love's urgent longing
ah, the sheer grace --
I went out unseen,
my house being now all stilled
... with no other light or guide
than the one that burned in my heart.
This guided me
more surely than the light of noon
to where You waited for me
You whom I knew so well.