Matthew 6: 19 - 23
19 "Do not lay up for yourselves treasures on earth, where moth and rust consume and where thieves break in and steal,
20 but lay up for yourselves treasures in heaven, where neither moth nor rust consumes and where thieves do not break in and steal.
21 For where your treasure is, there will your heart be also.
22 "The eye is the lamp of the body. So, if your eye is sound, your whole body will be full of light;
23 but if your eye is not sound, your whole body will be full of darkness. If then the light in you is darkness, how great is the darkness!

EWTN