Full Idea
Nothing can be thought of, imagined, spoken of, and therefore it is.
Gist of Idea
Nothing exists, as thinkable and expressible
Source
Georg W.F.Hegel (Science of Logic [1816], I.i.i.C.1 Rem 3 p.101), quoted by A.W. Moore - The Evolution of Modern Metaphysics 07.4
Book Reference
Moore,A.W.: 'The Evolution of Modern Metaphysics' [CUP 2013], p.172
A Reaction
This sounds like Meinong on circular squares. Does this mean that the negation of every truth also somehow exists? I struggle with this idea. Lewis Carroll nailed it.