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…Balarāma means guru-tattva. Balarāma represents guru. Yasya prasādād bhagavat-prasādaḥ. If we want to understand Caitanya Mahāprabhu, if we want to understand Kṛṣṇa, then we must take shelter of Balarāma. Nāyam ātmā bala-hinena labhyaḥ. This bala-hinena labhyaḥ, this Vedic injunction, means “Without the mercy of Balarāma you cannot understand, you cannot realize your spiritual identification. So that Balarāma comes as Nityānanda Prabhu.”
…So if we want actually peace of mind, if we actually want to be free from this material fatiguement, then we must take the shelter of Nityānanda Prabhu. Nityānanda Prabhu is the strength, spiritual strength. And without spiritual strength you cannot approach Kṛṣṇa.
The Hare Krishna Movement 