If your eye is evil, your whole body will be full of darkness. If then
the light that is in you is darkness, how great is that darkness ( 6:23).

In the spiritual sense of the Word by "eye" the understanding is meant.

[4] 2. _Neither were the genuine truths in which the spiritual sense of
the Word resides, revealed by the Lord until after the last judgment was
accomplished, and a new church, meant by the Holy Jerusalem, was about to
be established by the Lord._ The Lord foretold in the Apocalypse that
after the last judgment was effected genuine truths were to be revealed,
a new church was to be established, and the spiritual sense of the Word
would be disclosed. In the small work, _The Last Judgment,_ and later in
the _Continuation_ of that work, it was shown that the last judgment has
been accomplished and that this is meant by the heaven and earth which
would pass away (Apoc 21:1). That genuine truths are then to be revealed
is foretold in these words in the Apocalypse:

And he that sat upon the throne said, Behold, I make all things new
(11:5; also 19:17, 18; 21:18-21; 22:1, 2).

At 19:11-16 it was predicted that the spiritual sense of the Word was to
be revealed; it is meant by "the white horse" on which He who sat was
called the Word of God and was Lord of lords and King of kings (on this
see the little work _The White Horse)._ That by the Holy Jerusalem a new
church is meant which was to be established then by the Lord may be seen
in _Doctrine of the New Jerusalem about the Lord_ (nn. 62-65).

[5] It is clear, then, that the spiritual sense of the Word was to be
revealed for a new church which should acknowledge and worship the Lord