Augustine of Hippo
Catena Aurea · Matthäusevangelium 6
Lay not up for yourselves treasures upon earth, where moth and rust doth corrupt, and where thieves break through and steal: But lay up for yourselves treasures in Heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal: For where your treasure is, there will your heart be also.
(Serm. in Mont, ii. 13.) By heaven in this place I understand not the material heavens, for every thing that has a body is earthly. But it behoves that the whole world be despised by him who lays up his treasure in that Heaven, of which it is said, The heaven of heavens is the Lord’s, (Ps. 115:16.) that is, in the spiritual firmament. For heaven and earth shall pass away; (Mat. 24:35.) but we ought not to place our treasure in that which passes away, but in that which abides for ever.