Full Idea
As intuitively accepted by Spinoza without a previous mediation by dialectic, substance is as it were a dark shapeless abyss which engulfs all definite content as radically null, and produces from itself nothing that has a positive substance of its own.
Gist of Idea
The one substance is formless without the mediation of dialectical concepts
Source
Georg W.F.Hegel (Logic (Encyclopedia I) [1817], I §151Z p.215), quoted by A.W. Moore - The Evolution of Modern Metaphysics 07.6
Book Reference
Moore,A.W.: 'The Evolution of Modern Metaphysics' [CUP 2013], p.181
A Reaction
This seems to be an expression of idealism, since only what is conceptualised can exist.