Full Idea
If a man knows anything, he, by that very fact, knows that he knows it, and at the same time knows that he knows that he knows it, and so on to infinity.
Gist of Idea
Anyone who knows, must know that they know, and even know that they know that they know..
Source
Baruch de Spinoza (The Ethics [1675], II Pr 21)
Book Reference
Spinoza,Benedict de: 'Ethics, Improvement of Understanding, Letters', ed/tr. Elwes,R [Dover 1955], p.103
A Reaction
A delightfully bold claim! This is 'super internalism', but it seems to require that we must be certain in order to know, whereas I think my own view is internalist but 'fallibilist' - I know, while admitting I could be wrong.