Explain how Wordsworth use memory as a source of salvation in "Tintern Abbey."

I think the section of this amazing poem you want to refer
to is the last part, when Wordsworth addresses his sister and the power of memory is
mentioned in what he says to her. Wordsworth tells his sister to remember this present
moment and the beauty of nature in future when she may be feeling sad, afraid, alone or
upset. Remembering the beauty of nature and how it has impacted Wordsworth himself will
enable her to overcome those feelings. Note what the poem
says:

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Therefore let the
moon

Shine one thee in thy solitary
walk;

And let the misty mountain-winds be
free

To blow against thee: and, in after
years,

When these wild ecstasies shall be
matured

Into a sober pleasure, when they
mind

Shall be a mansion for all lovely
forms,

Thy memory be as a dwelling
place

For all sweet sounds and harmonies; oh!
then,

If solitude, or fear, or pain, or
grief,

Should be thy portion, with what healing
thoughts

Of tender joy wilt thou remember
me...

Memory then is
explicity associated with "healing thoughts" and is described as a "dwelling place / For
all sweet sounds and harmonies." I am not too sure that memory can be described as a
source of salvation--it seems a little too strong to me--but it is clear that Wordsworth
presents memory as something that we can use to overcome our present challenges through
focusing on the important lessons that we have learnt in the past. Our minds can become
a "mansion for all lovely forms," and through this we can overcome whatever fears or
doubts we are facing in the present.