So many times, people think that they know what the need and don't need, but they are really just blinding themselves. An example of something that individuals say they need, is a phone. They say they need a phone to keep in touch with parents. That's a valid excuse, but if you asked someone what they really need, they would say; food, water, shelter. The basic necessities of life. Those are the types of things that you need in your life, and this chapter of Walden was what it's all about.
Think about the writer, Henry David Thoreau. People think because he built a little hut beside Walden Pond, that he was a Hermit. That's the exact opposite of what Thoreau was. He visited Concord almost everyday, but all he was doing was living off the necessities of life. Food, Water, Shelter, and he also had a great view outside of his house, and he loved human interaction. Henry David Thoreau is really practicing what he preaches, in the necessities chapter, in his book, Walden.