You already explained to yourself. Intellectual knowledge is not
realisation, so if one does not have an intuitive knowledge but
only intellectual knowledge, then one is not realised. Everyone who
doesn't have intuitive knowing would know for himself that he
doesn't know intuitively, because, he simply doesn't know
intuitively. And it's difficult to describe intuitive knowing to
someone who doesn't have it.
On the other hand, if you have it, you will have no doubt you have
it because it's always there. Like your hand is always there, you
can feel it.. or your eye is always here, you can use it to
see.
The dharma eye once open, will always be there. And you will know
the truth of reality intuitively, just like you can know that there
is a computer screen in front of you intuitively, without someone
else telling you (that wld be intellectual knowledge), because you
can see.
