Full Idea
We maintain that it is absolutely necessary that every entity might not exist. ...The absolute is the absolute impossibility of a necessary being.
Gist of Idea
The absolute is the impossibility of there being a necessary existent
Source
Quentin Meillassoux (After Finitude; the necessity of contingency [2006], 3)
Book Reference
Meillassoux: 'After Finitude: the necessity of contingency', ed/tr. Brassier,R [Bloomsbury 2008], p.60
A Reaction
This is the main thesis of his book. The usual candidates for necessary existence are God, and mathematical objects. I am inclined to agree with Meillassoux.