The unquestionable subject

That is because your mind is disembodied from the world. It does not hear the world. It does not engage with the world as the world. It engages with the world as a projection of itself,

Disco mind

This absolute belief in the impossible disembodied mind is is an existential position that does not allow the questioning of the subject. That is a failure of the positions of Kierkegaard, Heidegger and Sartre (inauthenticities), but not Camus and Merleau-Ponty (authenticities).