John Chrysostom
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.
But forasmuch as not every earthly treasure is destroyed by rust or moth, or carried away by thieves, He therefore brings in another motive, For where your treasure is, there will your heart be also. As much as to say; Though none of these former losses should befal you, you will yet sustain no small loss by attaching your affections to things beneath, and becoming a slave to them, and in falling from Heaven, and being unable to think of any lofty thing.