Paraphrase the following lines from Thoreau's Walden:

"Superfluous wealth can buy superfluities only. Money is not required to buy one necessary of the soul."

When Thoreau says superfluous wealth he refers to money that is not needed or there is more of it than enough and that with all that money can be bought just things that we do not need. Those things make us blind for what should be really important in life. As he goes on in the second sentence - we can have money, but we can not buy what our soul needs. Life can be experienced far more fully when living simply.