The whole universe is phenomenal. But appearances exist. They must have a basis. Rejection of appearances is at the same time an affirmation of Reality. That the contradicted is appearance proves that the non-contradicted is the Reality.
All judgement implies a standard of truth.
Any attempt to doubt or deny Reality turns out to be an affirmation of it. Even appearances must find a place in Reality, for they somehow exist. But they must exist in Reality in such a way that they do not contradict themselves. The being of Reality consists in harmonious experience. This experience is not personal or subjective but the essence of the Absolute.