Prabhupāda: Rahasya means it is little difficult to understand. (break)
French Nun: (French) (break)
Prabhupāda: Just like Kṛṣṇa says in the Bhagavad-gītā, rahasyam, rahasyam etad uttamam. Rahasyam etad uttamam. This Bhagavad-gītā is the first-class mystic. Rahasyam etad uttamaṁ, bhakto 'si me priyo 'si me (BG 4.3): "Because you are My devotee, you are My dear friend, you'll understand."
So mysticism is not understandable by common man. It requires a special qualification. Just like to understand, it is also mysticism—understand, to understand God. This is also mystic. It is not understandable by ordinary man.