“It is a common empiricist assumption that I can know my experience simply by observing it. But this is not so. I do not observe my experience, but only its object. Any knowledge of experience must therefore involve knowledge of its object. But I can have knowledge of the object only if I can identify it as continous. Nothing can have temporal continuity without also having the capacity to exist when unobserved. Its existence is therefore independent of my perception.”
-Roger Scruton here.
This is part of a brief summary of Kant’s transcendental deduction, of which Scruton later says:
“It is fair to say that the transcendental deduction has never been considered to provide a satisfactory argument (boldface mine). In all its versions it involves a transition from the unity of consciousness to the identity of the subject through time. Hume pointed out that the slide from unity to identity is involved in all our claims to objective knowledge; he also thought that it could never be justified. Kant did not find the terms with which to answer Hume.”