Walden is a difficult book to read for three reasons: First, it was written in an older prose, which uses surgically precise language, extended, allegorical metaphors, long and complex paragraphs and sentences, and vivid, detailed, and insightful descriptions.
Thoreau does not hesitate to use metaphors, allusions, understatement, hyperbole, personification, irony, satire, metonymy, synecdoche, and oxymorons, and he can shift from a scientific to a transcendental point of view in mid-sentence.
Second, its logic is based on a different understanding of life, quite contrary to what most people would call common sense.
Ironically, this logic is based on what most people say they believe.
Thoreau, recognizing this, fills Walden with sarcasm, paradoxes, and double entendres.
He likes to tease, challenge, and even fool his readers.
And third, quite often any words would be inadequate at expressing many of Thoreau's non-verbal insights into truth.
Thoreau must use non-literal language to express these notions, and the reader must reach out to understand.

— Ken Kifer
Walden emphasizes the importance of solitude, contemplation, and closeness to nature in transcending the "desperate" existence that, he argues, is the lot of most people.
The book is not a traditional autobiography, but combines autobiography with a social critique of contemporary Western culture's consumerist and materialist attitudes and its distance from and destruction of nature.
That the book is not simply a criticism of society, but also an attempt to engage creatively with the better aspects of contemporary culture, is suggested both by Thoreau's proximity to Concord society and by his admiration for classical literature.
There are signs of ambiguity, or an attempt to see an alternative side of something common.
Some of the major themes that are present within the text are:
Self-reliance: Thoreau constantly refuses to be in "need" of the companionship of others.
Though he realizes its significance and importance, he thinks it unnecessary to always be in search for it.
Self-reliance, to him, is economic and social and is a principle that in terms of financial and interpersonal relations is more valuable than anything.
To Thoreau, self-reliance can be both spiritual as well as economic.
Connection to transcendentalism and to Emerson's essay.

Simplicity: Simplicity seems to be Thoreau's model for life.
Throughout the book, Thoreau constantly seeks to simplify his lifestyle: he patches his clothes rather than buy new ones, he minimizes his consumer activity, and relies on leisure time and on himself for everything.

Progress: In a world where everyone and everything is eager to advance in terms of progress, Thoreau finds it stubborn and skeptical to think that any outward improvement of life can bring inner peace and contentment.

The need for spiritual awakening: Spiritual awakening is the way to find and realize the truths of life which are often buried under the mounds of daily affairs.
Thoreau holds the spiritual awakening to be a quintessential component of life.
It is the source from which all of the other themes flow.

Man as part of nature
Nature and its reflection of human emotions
The state as unjust and corrupt
Meditation: Thoreau was an avid meditator and often spoke about the benefits of meditating.
Walden is a difficult book to read for three reasons: First, it was written in an older prose, which uses surgically precise language, extended, allegorical metaphors, long and complex paragraphs and sentences, and vivid, detailed, and insightful descriptions. Thoreau does not hesitate to use metaphors, allusions, understatement, hyperbole, personification, irony, satire, metonymy, synecdoche, and oxymorons, and he can shift from a scientific to a transcendental point of view in mid-sentence. Second, its logic is based on a different understanding of life, quite contrary to what most people would call common sense. Ironically, this logic is based on what most people say they believe. Thoreau, recognizing this, fills Walden with sarcasm, paradoxes, and double entendres. He likes to tease, challenge, and even fool his readers. And third, quite often any words would be inadequate at expressing many of Thoreau's non-verbal insights into truth. Thoreau must use non-literal language to express these notions, and the reader must reach out to understand.
— Ken Kifer
Walden emphasizes the importance of solitude, contemplation, and closeness to nature in transcending the "desperate" existence that, he argues, is the lot of most people. The book is not a traditional autobiography, but combines autobiography with a social critique of contemporary Western culture's consumerist and materialist attitudes and its distance from and destruction of nature. That the book is not simply a criticism of society, but also an attempt to engage creatively with the better aspects of contemporary culture, is suggested both by Thoreau's proximity to Concord society and by his admiration for classical literature. There are signs of ambiguity, or an attempt to see an alternative side of something common. Some of the major themes that are present within the text are:
Self-reliance: Thoreau constantly refuses to be in "need" of the companionship of others. Though he realizes its significance and importance, he thinks it unnecessary to always be in search for it. Self-reliance, to him, is economic and social and is a principle that in terms of financial and interpersonal relations is more valuable than anything. To Thoreau, self-reliance can be both spiritual as well as economic. Connection to transcendentalism and to Emerson's essay.
Simplicity: Simplicity seems to be Thoreau's model for life. Throughout the book, Thoreau constantly seeks to simplify his lifestyle: he patches his clothes rather than buy new ones, he minimizes his consumer activity, and relies on leisure time and on himself for everything.
Progress: In a world where everyone and everything is eager to advance in terms of progress, Thoreau finds it stubborn and skeptical to think that any outward improvement of life can bring inner peace and contentment.
The need for spiritual awakening: Spiritual awakening is the way to find and realize the truths of life which are often buried under the mounds of daily affairs. Thoreau holds the spiritual awakening to be a quintessential component of life. It is the source from which all of the other themes flow.
Man as part of nature
Nature and its reflection of human emotions
The state as unjust and corrupt
Meditation: Thoreau was an avid meditator and often spoke about the benefits of meditating.
Walden