The Braille on this hat, if translated, reads John 9:25 -- "I was blind, now I see.” Jesus healed a blind man who is quickly brought before the pharisees and asked to testify about what Jesus did. His response was the above verse. Just like this healed blind man, sometimes the strongest way we can witness to the goodness of the Lord is to point out the miracles he has done in our lives. 

Don't just speak, Witness.