TCR 11 - belief and knowledge

TCR 11 [3]

Belief in God 
comes into a person by the front door,
that is, from the soul
into the higher regions of the understanding.
But knowledge about God 
comes in by the back door,
because it is absorbed by the understanding
from the revelation of the Word
by means of the bodily senses.
The two paths leading in
meet in the midst of the understanding;
there, natural belief,
which is merely a strongly held opinion,
becomes spiritual,
that is to say, a real acknowledgment.
So the human understanding
is like an exchange where currencies are changed.