No Evil in Heaven?

Philosopher Graham Oppy writes:

. . . if it is part of the essence of heaven that it should be a place in which there is no evil, then there is at least some reason to think that heaven must also be a place in which human beings have severely limited freedom of action. . . . [For] no agents are free to perform evil actions in heaven.*

What say you?

*Graham Oppy, Arguing about Gods (Cambridge, 2006), 315