There is suffering and knowledge of it, but both the suffering and the knowledge of it are illusory, lacking true existence. There are causes of suffering and they must be abandoned, but both the causes and their abandonment are illusory, lacking true existence. There is cessation of suffering and it must be manifested, but both cessation and its manifestation are illusory, lacking true existence. Paths to cessation of suffering must be meditated upon, but the true path and meditation on it are both illusory, lacking true existence. This realization of the illusory, empty nature of the Four Noble Truths is the final result of meditation on the Four Noble Truths.
From Precious Teachings, by Khenpo Karten Rinpoche, page 36 in print version (page 42 in PDF version), “Essence of Buddhism as Related to the Four Noble Truths.”