vyāsa-prasādāt — by the mercy of Vyāsadeva; śrutavān — have heard; etat — this; guhyam — confidential; aham — I; param — the supreme; yogam — mysticism; yoga-īśvarāt — from the master of all mysticism; kṛṣṇāt — from Kṛṣṇa; sākṣāt — directly; kathayataḥ — speaking; svayam — personally.