When Kṛṣṇa wanted to understand Himself, He took the tendency of Śrīmatī Rādhārāṇī. And that is Caitanya Mahāprabhu. Rādhā-bhāva-dyuti-suvalitam. Caitanya Mahāprabhu is Kṛṣṇa, but He has accepted the propensities of Rādhārāṇī. As Rādhārāṇī is always in feelings of separation of Kṛṣṇa, similarly, in the position of Rādhārāṇī, Lord Caitanya was feeling separation of Kṛṣṇa. That is the teachings of Lord Caitanya, feelings of separation, not meeting. The process of devotional service taught by Caitanya Mahāprabhu and His disciplic succession is how to feel separation from Kṛṣṇa. That is Rādhārāṇī's position, always feeling the separation.
The Gosvāmīs, they also, when they were in Vṛndāvana, they never said that "I have seen Kṛṣṇa." Although they were the most perfect, they never said that "I have seen Kṛṣṇa." Their prayers were like this: he rādhe! vraja-devike! he nanda-suno! kutaḥ. He rādhe, Rādhārāṇī, he rādhe! vraja-devike! ca. Rādhārāṇī does not remain alone. He (She) remains always with His (Her) friends, vraja-devī, Lalitā or Viśākha and other damsels of Vṛndāvana. So the Gosvāmīns are praying, in their mature stage, when they were living at Vṛndāvana, they were praying in this way, he rādhe! vraja-devike! ca lalite! he nanda-suno! kutaḥ: "Where, Rādhārāṇī, where You are? Where are Your associates? Where You are, Nanda-suno, the son of Nanda Mahārāja, Kṛṣṇa? Where you are, all?" They were searching after. They never said, "I have seen Kṛṣṇa dancing with the gopīs. Last night I saw." (laughter) This is sahajiyā. This is not mature devotee. This is called... They are called sahajiyā. They take everything very cheap—Kṛṣṇa very cheap, Rādhārāṇī very cheap—as if they can see every night. No. The Gosvāmīs do not teach us like that. They're searching after. He rādhe! vraja-devike! ca lalite! he nanda-suno! kutaḥ, śrī-govardhana-pādapa-tale kālindī-vanye kutaḥ: "Are you there under the Govardhana Hill or on the banks of the Yamunā?" Kālindī-vanye kutaḥ. Ghoṣantāv iti sarvato vraja-pure khedair mahā-vihvalau. Their business was crying like this, "Where You are? Where You are, Rādhārāṇī? Where you are, Lalitā, Viśākha, the associates of Rādhārāṇī? Where You are, Kṛṣṇa? Are You near Govardhana Hill or on the bank of the Yamunā?" Ghoṣantāv iti sarvato vraja-pure. So throughout the whole tract of Vṛndāvana they were crying and searching after Them, khedair mahā-vihvalau, as if madman. Khedair mahā-vihvalau. Vande rūpa-sanātanau raghu-yugau śrī-jīva-gopālakau.
So we have to follow the footprints of the Gosvāmīs, how to search out Kṛṣṇa and Rādhārāṇī, Vṛndāvana, or within your heart. That is the process of Caitanya Mahāprabhu's bhajana: feeling of separation, vipralambha, vipralambha-sevā. Just like Caitanya Mahāprabhu, feeling the separation of Kṛṣṇa, He was falling down on the sea. He was coming out of His rest room or His bedroom and going out at dead of night. Nobody knew where He has gone. So that was His searching. This process of devotional service is taught by Caitanya Mahāprabhu. Not that very easily, "We have seen Kṛṣṇa or seen Rādhārāṇī in rāsa-līlā." No, not like that. Feel the separation. The more you feel separation from Kṛṣṇa, you should understand that you are advancing. Don't try to see Kṛṣṇa artificially. Be advanced in separation feeling, and then it will be perfect. That is the teachings of Lord Caitanya. Because with our material eyes we cannot see Kṛṣṇa. Ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ (CC Madhya 17.136). With our material senses we cannot see Kṛṣṇa, we cannot hear about Kṛṣṇa's name. But sevonmukhe hi jihvādau. When you engage yourself in the service of the Lord... Where the service begins? Jihvādau. The service begins from the tongue. Not from the legs, eyes, or ears. It begins from the tongue. Sevonmukhe hi jihvādau. If you begin service through your tongue... How? Chant Hare Kṛṣṇa. Use your tongue. Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. And take Kṛṣṇa prasādam. The tongue has got two business: to articulate sound, Hare Kṛṣṇa; and take prasādam. By this process you'll realize Kṛṣṇa.
Prabhupāda: Don't try to see Kṛṣṇa. You cannot see Kṛṣṇa with your material eyes. Neither you can hear about Him with your material ears. Neither you can touch. But if you engage your tongue in the service of the Lord, then He'll reveal Himself to you: "Here I am." That is wanted. So feel separation of Kṛṣṇa just like Rādhārāṇī, as Lord Caitanya teaches us, and engage your tongue in the service of the Lord; then, one day, when you are mature, you'll see Kṛṣṇa eye to eye.
Thank you very much.