I offer these quotes as a hypocrite who strives to live less in the world of things.  I found many of these on a site called Tentmaker.

It is preoccupation with possessions, more than anything else, that prevents us from living freely and nobly. --Thoreau 

Any so-called material thing that you want is merely a symbol: you want it not for itself, but because it will content your spirit for the moment. --Mark Twain

An object in possession seldom retains the same charm that it had in pursuit. –Pliny the Younger

Many go fishing all their lives without knowing that it is not fish they are after.— Thoreau

Possessions are usually diminished by possession. –Nietzsche

The saddest thing I can imagine is to get used to luxury. --Charlie Chaplin

Most of the luxuries and many of the so-called comforts of life are not only not indispensable, but positive hindrances to the elevation of mankind. --Thoreau

The man who pets a lion may tame it, but the man who coddles the body makes it ravenous.-- John Climacus

The most terrible thing about materialism, even more terrible than its proneness to violence, is its boredom, from which sex, alcohol, drugs, all devices for putting out the accusing light of reason and suppressing the unrealizable aspirations of love, offer a prospect of deliverance. --Malcolm Muggeridge

All earthly joy begins pleasantly, but at the end it gnaws and kills. --Thomas a’Kempis

You say, 'If I had a little more, I should be very satisfied.' You make a mistake. If you are not content with what you have, you would not be satisfied if it were doubled. --Charles Haddon Spurgeon 

Earth provides enough to satisfy every man's need, but not every man's greed.--Mahatma Gandhi 

Thousands upon thousands are yearly brought into a state of real poverty by their great anxiety not to be thought of as poor.—Robert Mallett

He is no fool who gives what he cannot keep to gain what he cannot lose. --Jim Elliot

The be-all and end-all of life should not be to get rich, but to enrich the world. -- B. C. Forbes

A man has made at least a start on discovering the meaning of human life when he plants shade trees under which he knows full well he will never sit.--D. Elton Trueblood 

Learn to live a life of honest poverty, if you must, and turn to more important matters than transporting gold to your grave. – Credenda

That man is the richest whose pleasures are the cheapest. -- Thoreau