What He said is like this: Bury not gold in the earth, nor do any other such thing, for you do but gather it for the moth, and the rust, and the thieves. And even if you should entirely escape these evils, yet the enslaving of thine heart, the nailing it to all that is below, you will not escape: "For wheresoever thy treasure may be, there is thine heart also." ...
-St. John Chrysostom, Homily 20 on Matthew 6, 4th Century