The Noumenal vs the PhenomenalQUOTE(WP Article on Philosophy)
Kant, in particular, claimed that there were philosophical questions that could only be answered by going beyond reason.
I have no idea what Kant claimed, since I frankly never read the guy's work.
But I do agree with the quoted sentiment, nonetheless, modulo the definition of
reason.
There are some philosophical questions that can only be answered by doing original research. And while it's eminently reasonable to do original research, I dunno if the discovery learning process that comprises the bulk of a research agenda is itself an instance of
reason.
In Philosophy, there is a distinction between the
Noumenal — that which can be captured by pure thought — and the
Phenomenal — that which can be captured by the senses.
When doing original research, much new information is captured by the senses.