Lay not up for yourselves treasures upon earth, where moth and rust does corrupt, and where thieves break through and steal:
All Commentaries on Matthew 6:19 Go To Matthew 6
Augustine of Hippo
AD 430
If someone does something with the intent of gaining earthly profit, that one’s heart is upon the earth. How can a heart be clean while it is wallowing in the mud? On the other hand, if it be fastened upon heaven it will be clean, for whatever is heavenly is unpolluted. A thing becomes defiled if it is mixed with a baser substance, even though that other substance be not vile in its own nature. Gold, for example, is debased by pure silver if mixed with it. So also is our mind defiled by a desire for the things of earth, although the earth itself is pure in its own class and in its own order. .
