But when anything is exposed by the light, it becomes visible,  for anything that becomes visible is light. Therefore it says, “Awake, O sleeper, and arise from the dead, and Christ will shine on you.” (ESV)
We continue to look at this contrast between darkness and light. We, who belong to Christ, are now light. We are to shine the light of Christ in our dark world. As a result those living in darkness receive an invitation to come to God's light. God uses us to shine his light. That is quite a responsibility, and a privilege!
In verse 14 Paul makes a reference to the prophet Isaiah. Even in the Old Testament God promised salvation through Christ. Notice how the prophet uses the same imagery of light and darkness:
 Arise, shine, for your light has come, and the glory of the LORD has risen upon you. (ESV)
When you walk in light you shine on those in darkness around you. The only way that people will come to know Christ is if his light shines upon them. And his chosen vehicle of shining light is through us! Conversely, when we, who claim to know Christ, choose to walk in darkness, we hinder the light of Christ from being seen by those who so desperately need to be transformed.
How are you walking? Are you walking in the light? Is Christ able to shine through you? Your light that you shine is the invitation to those in darkness to be transformed. Shine brightly!