Full Idea
The totality of things has always been just like it is now and always will be. For there is nothing for it to change into. For there exists nothing in addition to the totality, which could enter into it and produce the change.
Gist of Idea
The totality is complete, so there is no room for it to change, and nothing extraneous to change it
Source
Epicurus (Letter to Herodotus [c.293 BCE], 39)
Book Reference
Epicurus: 'The Epicurus Reader', ed/tr. Inwood,B. /Gerson,L. [Hackett 1994], p.6
A Reaction
This smacks of the sort of dubious arguments that the medieval theologians fell in love with. I never thought I'd say this, but I think Epicurus needs a comprehensive course in set theory before he makes remarks like this.
Related Idea
Idea 14028 Nothing comes to be from what doesn't exist [Epicurus]