The light inside of believers will shine out

Your eye is like a lamp that provides light for your body. When your eye is healthy, your whole body is filled with light. But when it is unhealthy, your body is filled with darkness. (Luke 11:34 NLT)

 According to medical understanding in ancient times, the eyes didn’t allow light to come in, but rather people had light within them and this light came out of their eyes, which caused them to see. Jesus’ saying reflects this ancient concept. The hearers would have understood that Jesus was referring to the eyes as the source of light emanating from the body, which could be either healthy or unhealthy. If the eye is healthy, it indicates that the person is inwardly full of light, which the eye is emitting. However, if the eye is unhealthy and thus not emitting light, it shows that the person is full of darkness.
 Jesus was speaking about a person’s inner self, their spiritual condition. If the eye wasn’t healthy, then the inner being of the person was dark, without any spiritual light—they were morally unhealthy.
 The light inside of believers will shine out, like a lamp that is lit. Those who believe in Him and His teachings, without any hardness of heart, are inwardly spiritually healthy, full of light. They will shine with Jesus’ light in the same way someone in a dark room stands out when a light is shining on them.
 “You, Lord, keep my lamp burning; my God turns my darkness into light. (Psalm 18.28) —Peter Amsterdam [1]

 You are the light of the world. You are an instrument of the Divine. You are the greatest miracle in the world. Life is graced by your presence. —Iyanla Vanzant

[1] Activated Jesus—His Life and Message: Light