Verse 14 is probably based on Isaiah chapter 60:1 or suggested by it: ‘Wherefore he saith’ – who says? Where does he say it? Where is the quotation from? Well, maybe Isaiah 60:1, but the idea here is that the gospel says it, the light of Christ says it. ‘Wherefore he’ – Christ in the gospel; it is not meant to be a direct quote – says, ‘Wake up, sleeping soul and arise from your dead condition and Christ will give you light and understanding.