Pradyumna: "Śrī Vyāsadeva asserts herein that Śrī Kṛṣṇa is the original Personality of Godhead and all others are His direct or indirect plenary portions or portion of the portion. Śrīla Jīva Gosvāmī has even more explicitly explained the subject matter in his Kṛṣṇa Sandarbha, and Brahmā, the original living being..."
Prabhupāda: Jīva Gosvāmī has got six sandarbhas, theses: Bhagavat-sandarbha, Kṛṣṇa-sandarbha, Tattva-sandarbha, Prīti-sandarbha, like that. So these books are... I don't think it is published in English. So these sandarbhas are so philosophically discussed that throughout the whole world, there is not a single philosopher who can defy these Jīva Gosvāmī's six sandarbhas. Our, this Gauḍīya-sampradāya... We belong to Gauḍīya-sampradāya—Lord Caitanya Mahāprabhu, from the disciplic succession of Caitanya Mahāprabhu. We have got immense literature to understand God. One who wants to understand God through philosophy, science, argument, logic, so to supply them material, we have got immense literature, Vedic literature. So one of them is mentioned here, Kṛṣṇa-sandarbha, what is Kṛṣṇa.