The ways in (to heaven) are the witnesses who first told the story of salvation. Believing the story, and being a character in the story, therefore, is the way in. And seeing such people is what will persuade the nations to believe the story and come in, too.

Tombs have a disobliging tendency to become shrines where death and vengeance are turned into virtues and sacred obligations. Maybe that is why the only tomb we celebrate is an empty one, where life, not death, is a sacred obligation, and vengeance is none of our business.