Śrīla Viśvanātha Cakravartī Ṭhākura explains the word mat pradhānāḥ as follows. Lord Kṛṣṇa is naturally the shelter of the eight primary mystic potencies and meditations because such perfections emanate from the Lord’s personal potency, and thus they are fully developed only within the Lord Himself and the Lord’s personal associates. When materialistic persons mechanically acquire such potencies, the perfections awarded are of an inferior degree and are considered to be manifestations of māyā, illusion. A pure devotee of the Lord automatically receives from the Lord wonderful potencies to execute his devotional service. If for sense gratification one mechanically endeavors to acquire mystic perfections, then these perfections are certainly considered to be inferior expansions of the Lord’s external potency.