Therefore, Catholic Christians believe that the Bible--written
tradition--is not the only source of Revelation.
And, as Catholic Christians believe, the Bible does not teach
that it is the only source of Revelation.
Now Jesus did many other signs in the presence of
(his) disciples that are
not written in this book
There are also
many other things
that Jesus did, but
if these were to be described individually, I do not think
the whole world would contain the books that would