Namely, it is an attempt to exhibit apparent nature as an effluent from the mind because of causal nature.

The whole notion is partly based on the implicit assumption that the mind can only know that which it has itself produced and retains in some sense within itself, though it requires an exterior reason both as originating and as determining the character of its activity.

But in considering knowledge we should wipe out all these spatial metaphors, such as 'within the mind' and 'without the mind.' Knowledge is ultimate.

There can be no explanation of the 'why' of knowledge; we can only describe the 'what' of knowledge.

Namely we can analyse the content and its internal relations, but we cannot explain why there is knowledge.