"Amazing! I know I've read it many times before, but I never SAW it!" Expressions like this erupt from many Christians who have made it a habit of reading their Bible. We seem to be blinded to stuff in Scripture that seems so obvious -- once we've seen it! It's the "once we've seen it part" that blows our minds.
Back to my initial point. Not only did JESUS rise from the dead (which is a game stopper), but "many saints" went into Jerusalem at the same time. Really? Yes. Come on! A bunch of formerly dead saints came out of the tombs and walked right into town and appeared to many friends and strangers. Can you imagine what that must have done? Jerusalem and the surrounding areas boasted at certain times of the year hundreds of thousands of people!! This is amazing in the least! And so widely known was Jesus' resurrection that the Emmaus road disciples (Luke 24) could not believe that their traveling companion (Jesus himself though they had not yet figured that out) had not heard! How could you NOT have heard? Nothing has been more broadcast!
OK. So, Jesus' death, burial, and resurrection took place among multiplied thousands (perhaps over a million) who HAD heard the news. And now, word was getting out that not only Jesus but many, many dead people ("saints") also had been seen walking about town talking to friends and relatives. We've seen strange things before, but NOTHING like this!
That defies belief. Or, . . . DEFINES it. . . . See the unseen in order to know the unknown. Lord, open our eyes to behold wondrous things out of your Word.