The eye is the lamp of the body. So if your eye is sound, your entire body will be full of light. But if your eye is unsound, your whole body will be full of darkness. If then the very light in you is darkness, how dense is that darkness! (Matt. 6:21-22)
In this teaching YAHSHUA covered several subjects including fasting, treasure and mammon. It is important to understand that the eye is the entrance to the soul. It is through the eyes that we perceive. When the treasures of this world are often desired and we lust after them, we will go a distance to acquire them. They become gods when our time is primarily spent seeking and obtaining them. The Christian people are not exempted from this and many have left the way for them. YAHSHUA said, Do not gather and heap up and store up for yourselves treasures on earth, where moth and rust and worm consume and destroy, and where thieves break through and steal. But gather and heap up and store for yourselves treasures in heaven, where neither moth nor rust nor worm consume and destroy, and where thieves do not break through and steal. For where your treasure is, there will your heart be (Matt. 6:19-21). What was the meaning for our Lord YAHSHUA to connect the eye with earthly treasure, and what has one to do with the other?
Light from the Word 