Prabhupāda: Just like practical science. If you want to pass B.A. examination, you have to appear for theoretical and practical, both.
Dr. Patel: Theory and practice both.
Prabhupāda: Yes. So this bhakti-yoga means to know God, at the same time, practically employ yourself in the service of God, or in the transaction between God and yourself. That is vijñānam. Sa-vijñānam.
Indian man (1): What is the distinction between jñāna and vijñāna?
Prabhupāda: Jñāna means theoretical knowledge, and vijñāna means practical knowledge. Simply to know "God is great," that is not sufficient.
Indian man (1): No, that is theoretical.
Prabhupāda: Yes, that is theoretical. You must know how great He is. That we have to learn from the śāstras, from the guru, how great He is. Just like in the Brahma-saṁhitā, Vedic, yato vā imāni bhūtāni jāyante (Taittirīya Upaniṣad 3.1). He's the source of all material elements. In Him everything stays, and after annihilation, everything goes into Him. This is one understanding. Nityo nityānāṁ cetanaś cetanānām (Kaṭha Upaniṣad 2.2.13).
Mr. Sar: Eko bahūnāṁ vidadhāti kāmān.