Full Idea
The major shift that has occurred in the conception of thought from Kant's time to ours is from the unknowability of the thing-in-itself to its unthinkability.
Gist of Idea
In Kant the thing-in-itself is unknowable, but for us it has become unthinkable
Source
Quentin Meillassoux (After Finitude; the necessity of contingency [2006], 2)
Book Reference
Meillassoux: 'After Finitude: the necessity of contingency', ed/tr. Brassier,R [Bloomsbury 2008], p.44
A Reaction
Meillassoux is making the case that philosophy is alienating us more and more from the triumphant realism of the scientific revolution. He says thinking has split from being. He's right. Modern American pragmatists are the worst (not Peirce!).