Providentliving.org is a website from the LDS Church that provides self-reliance and welfare resources. Among theses resources is a list of quotes dealing with materialism.
Just one of the many quotes:
"Of course, none of us ever has enough. At least that is what we think. No matter our circumstances, we want to improve them. This, too, is good if it is not carried to an extreme. I am satisfied that the Father of us all does not wish His children to walk in poverty. He wants the best for them. He wants them to have comforts and some of the good things of the earth. . . . It is when greed takes over, when we covet that which others have, that our affliction begins. And it can be a very sore and painful affliction."
(Gordon B. Hinckley, Teachings of Gordon B. Hinckley , 252).