AC 6419 - "To march upon the wall" (Genesis 49:22); AC 6423 - why truth is strong

AC 6419 [2]
"To march upon the wall"
(Genesis 49:22)
is said because in the internal sense
the subject treated of is assault on truth by falsities,
and defense of truth against falsity;
for the spiritual church,
which is represented by Joseph,
is continually being assaulted,
but the Lord continually defends it.
Consequently in the Word
what belongs to this church is compared to a city,
which has a wall, outworks, gates, and bars;
and by the assaults on that city
are described the assaults on truth by falsities;
so also a "city" signifies doctrinal things,
and its "wall" the truths of faith which defend it,
and in the opposite sense
the falsities which are being destroyed.
That a "wall" signifies the truths of faith which defend . . . :
    
We have a strong city;
salvation will He appoint for walls and bulwark.
Open ye the gates,
that the righteous nation 
which keeps faithfulness
may enter in.
(Isaiah 26:1)

I have set watchmen upon thy walls, O Jerusalem;  
they shall not be silent all the day and the night,
keeping Jehovah in mind.
(Isa. 62:6)

AC 6423
The reason why truth is strong,
is that good acts through truth;
for good is of such a nature
that nothing of evil or of falsity can approach it,
thus none of the infernal crew,
who flee far away when good approaches,
or an angel who is in good.
But in order that good may fight with that crew
which is with a person from hell,
and protect him in every way,
. . .it acts through truth,
for in this way it can approach them.