Full Idea
Every intellectual determination has its antithesis, its contradiction. Truth exists not in unity with, but in refutation of its opposite.
Gist of Idea
Each proposition has an antithesis, and truth exists as its refutation
Source
Ludwig Feuerbach (Towards a Critique of Hegel's Philosophy [1839], p.72)
Book Reference
Feuerbach,Ludwig: 'The Fiery Brook: Selected Writings', ed/tr. Hanfi,Zawar [Anchor 1972], p.72
A Reaction
This appears to be a rejection of the 'synthesis' in Hegel, in favour of what strikes me as a rather more sensible interpretation of the modern dialectic. Being exists in contrast to nothingness, and truth exists in contrast to its negation?