How many times have you had someone say to you," Hey, if God is real and wants everyone to know Him why doesn't He just show His face?"? How many times have you pondered whether there is any merit to that idea? I know I have on numerous occasions and usually have come to the same conclusion, which is that Jesus did show up and even then very few actually believed Him. He did miracles, raised the dead, rose from the dead and still the people did not believe. Even the Pharisees who had the Roman guards tell them that they saw happen refused to believe.
I think the sad fact of things is that it does not matter what God can show us there will be those who choose the hardness of their hearts and therefore blind their own eyes. Take a look through Revelations some time and you will see this very thing. God unleashes revelations and catastrophes one after another and yet the people who choose to revile Him will not open their eyes and in the end they will choose to cry out to the rocks and mountains to fall on them so they do not have to see the One Who is enthroned forever. It would seem that blindness is a choice and that no amount of revelation can change that.