When talking about Christianity, a lot of people say something like, "If God really wants me to believe, he should show me some sort of unmistakable sign.  That way, there'd be no way I could doubt the existence of God."  The official response to that question is this:  God already did that.  But people didn't believe the sign, beat him up, and killed him.  The typical re-response to that is something along the lines of, "Well that was 2000 years ago.  How about something recent?" 

The thing is, I don't think some people will believe any sign, no matter how convincing it is.  The people in Jesus' day didn't believe the things they saw him do on a daily basis.  Today's Our Daily Bread talks about this.  It talks about a passage from John, right after the story of Jesus feeding over 5000 people with a few loaves of bread and a few fish.  After this miraculous event, Jesus took a boat to the other side of the lake, and a bunch of the people came after him.  Jesus calls them out, saying (basically), "You're trying to find me so you can benefit from these cool miracles I'm performing.  You should really be trying to find out about God and eternal life." (vs. 26-27).  In response, the people ask him to perform a miracle so they'll know he's legit.  If that wasn't bad enough, they mention a story from several thousand years in Israel's past where God provided bread (manna) for his people to eat while they were living in the desert.  So in other words, the people saw Jesus perform a miracle, and then they asked him to basically perform the same one again. 

My point is this:  People ask for a sign, but they've historically rejected or denied that sign.  So maybe a sign isn't what it's gonna take.  Maybe what God says is right:  "You will seek me and find me when you seek me with all your heart."  Or maybe that cover-all "Christian cop-out" called "faith" is where it's at:  "Now faith is being sure of what we hope for and certain of what we do not see." #religion