tān - those; aham - I; te - unto you; abhidhāsyāmi - will describe; deva-vrata - of Bhīṣmadeva; mukhāt - from the mouth; śrutān - heard; jñāna - Vedic knowledge; vairāgya - detachment; vijñāna - self-realization; śraddhā - faith; bhakti - and devotional service; upa-bṛṁhitān - consisting of.

I will now speak unto you those religious principles of Vedic knowledge, detachment, self-realization, faith and devotional service that were heard directly from the mouth of Bhīṣmadeva.