When I see something like this in scripture, something that does not seem to make sense to me, it is a flag to sit up and take notice. Why would Paul, and ultimately the Holy Spirit use mind here instead of eyes? It seems to speak to understanding, rational thought, logical thinking. Earlier in 2 Corinthians 1:13 Paul says that he expects people to understand what he is writing. Here the triad of see, mind, and light must deal with cognitive understanding not an optical process.
As believers there is a tendency to spiritualize, mysticize, or turn Biblical truth in to some emotive experience that at some level requires us to hang our intellect at the front door of the church. But twice here in the first four chapters of 2 Corinthians Paul speaks of engaging one’s mind, and I have counted 39 such references in Philippians.
It seems as though Paul puts a premium on thinking about the Christian life. It seems that he thinks the gospel makes rational sense.