How is this symbolism of the wall appropriate in The Wanderer?

The following lines appear in the Anglo-Saxon poem
The Wanderer:

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as now here and there across this
Middle-Earth
blown on by wind walls
stand

In this stanza, the
narrator is speaking about what a wise man must come to understand before he can be
considered wise. In the lines in question, the wall symbolizes the barriers men must
face and overcome when he realizes that the entire world will lie in
waste.

Throughout the poem, the narrator speaks to the fact
that the Wanderer has been forced to face many different challenges in life. He has lost
his king, his kinsmen, and his home. He has been forced to climb many walls in order to
find the one thing in life that will, for lack of a better phrase, "make the world a
better place" for himself.

In the end, the Wanderer comes
to find out that there is only one thing that one can depend on to survive forever:
faith. In order to come to this, the Wanderer needed to climb many different
walls.

The wall represents two very different things.
First, it represents the literal physical walls the Wanderer comes upon during his
travels upon the sea.

Second, the wall is a figurative
concept that symbolizes the mental walls the Wanderer must scale in order to find
security.