He did not mean greater in the sense as preform miracles, if you read THE HOLY BIBLE you would know this is when Jesus Christ is about to go be crucified for mans sins, what Jesus means is people will go through more punishment, and more suffering to do less then he accomplished. Christ saved the world from eternity of hell fire. So some guy may be tortured for weeks and killed slowly for not telling some atheist, or pagan (because torturing and killing against GOD's laws) where they key is to some little girls room. He went through more pain, and his death accomplished less. But make no mistake there is nothing greater than the fact THE ALMIGHTY GOD willingly sacrificed his only beloved Holy Son so that the blasphemers, sodomites, murders, homosexuals, people who fornicate with animals, all that disgusting evil can live forever in a place one can't imagine, and just completely erase the fact one did these things, with a new perfect body unimaginable.