This passage from the Bible advises people to store up treasures in heaven rather than on earth, because earthly treasures can be destroyed by natural causes or stolen. It also warns that we cannot serve both God and money, and will end up loving one and hating the other. Our priorities and values are shown through how we use our eyes, as the eye is the lamp of the body - if our eyes are focused on heavenly or earthly things, it will fill our whole being with either light or darkness.