What does Thoreau talk about in the conclusion to Walden?

Thoreau brings up all circumstances of men. He encourages
his readers to not necessarily compare their own life conditions to other men, but to
value the circumstances they have themselves for the features of what can be learned
from them.

He says:

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However mean your life is, meet it and live it;
do not shun it and call it hard
names.

I feel at times as
if he is simply referring to a similar adage that our society sometimes notes today:
"Don't worry, be happy."

He encourages man to consider what
one's current situation has to offer and think to make the most of it. He encourages the
common man to think, who knows what lies ahead?

Thoreau's
Conclusion to Walden is specifically optimistic after having his period of reflection.
This period leaves room for him to consider that others might benefit from such
experiences.

I would encourage you to read the last
paragraph again. Often an author saves a nugget of strong truth for that last
paragraph.