
Rabanus Maurus
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.
Allegorically; Rust denotes pride which obscures the brightness of virtue. Moth which privily eats out garments, is jealousy which frets into good intention, and destroys the bond of unity. Thieves denote heretics and demons, who are ever on the watch to rob men of their spiritual treasure.