why do you think thoreau believes that living in nature is the only way to truly "live"?

Do you have a chapter for this question? I am working from an etext...... no page numbers. Sorry.....

Where i lived, and what i lived for.. from this passage "I went to the woods because i wished to live deliberately...and to see if i could not learn what it had to teach, and not, when i came to die, discover that i had not lived"

Thoreau says, "I went to the woods to live deliberately, to front only the essential facts of life, and see if I coudl not learn what it had to teach, and not, when I came to die, discover that I had not lived." He wants to know life's true meanness or true sublimeness and give a true account of it, not be like men who live in uncertainty about the meaning of life. Here, he urges "Simplicity! Simplicity! Simplicity!," telling people to simplify their affairs and arguing that so-called "improvements" like railroads, which make life too fast and superficial. Here, with a play on words, he compares the "sleepers" on the railroad to the men who work on it, who are "sleepers" because they are not awake enough to appreciate life.