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Šrū Caitanya -caritāmrta
[[Madhya-lilā, Ch. 5]]
PURPORT
Like these two  brāhmaṇas  of Vidyānagara, there are many devotees who are eternal servants of the Lord. They are specifically known as  nitya-siddha , eternally perfect. Although the  nitya-siddhas  appear in the material world and seem to be common members of the world, they never forget the Supreme Personality of Godhead in any condition. This is the symptom of a  nitya-siddha .
There are two kinds of living entities— nitya-siddha  and  nitya-baddha . The  nitya-siddha  never forgets his relationship with the Supreme Personality, whereas the  nitya-baddha  is always conditioned, even before the creation. He always forgets his relationship with the Supreme Personality of Godhead. Here the Lord informs the two  brāhmaṇas  that they are His servants birth after birth. The phrase birth after birth refers to the material world because in the spiritual world there is no birth, death, old age or disease. By the order of the Supreme Personality of Godhead, the  nitya-siddha  remains within this material world like an ordinary man, but the only business of the  nitya-siddha  is to broadcast the glories of the Lord. This incident appears to be an ordinary story about a marriage transaction involving two ordinary people. However, Kṛṣṇa accepted the two  brāhmaṇas  as His eternal servants. Both  brāhmaṇas  took much trouble in these negotiations, just like mundane people, yet they were acting as eternal servants of the Lord. All  nitya-siddhas  within this material world may appear to toil like ordinary men, but they never forget their position as servants of the Lord.
Another point: The elderly  brāhmaṇa  belonged to an aristocratic family and was learned and wealthy. The young  brāhmaṇa  belonged to an ordinary family and was uneducated. But these mundane qualifications do not concern a  nitya-siddha  engaged in the service of the Lord. We have to accept the fact that the  nitya-siddhas  are completely distinct from the  nitya-baddhas , who are ordinary human beings. Śrīla Narottama dāsa Thākura confirms this statement:
gaurāṅgera saṅgi-gaṇe,    nitya-siddha kari’ māne,    se yāya vrajendra-suta pāśa śrī-gauḍa-maṇḍala-bhūmi,    yebā jāne cintāmaṇi tāra haya vraja-bhūme vāsa
One who accepts the associates of Lord Caitanya Mahāprabhu as  nitya-siddhas  is certain to be elevated to the spiritual kingdom to become an associate of the Supreme Lord. One should also know that Gauḍa-maṇḍala-bhūmi—those places in Bengal where Śrī Caitanya Mahāprabhu stayed—are equal to Vrajabhūmi, or Vṛndāvana. There is no difference between the inhabitants of Vṛndāvana and those of Gauḍa-maṇḍala-bhūmi, or Śrīdhāma Māyāpura.
TEXT 114
দু  ঁহার সত্যে   তু  ষ্ট হইলাঙ,  দু ঁহে মাগ’ বর ।”  
 দুই বিপ্র বর মাগে আনন্দ-অন্তর ॥ ১১৪ ॥