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Šri Caitanya-caritāmrta
[[Madhya-lilā. Ch 19
prāyaḥ svasukha-jātīyaṁ sukhaṁ syād atra yoginām kintv ātma-saukhyam aghanaṁ ghanaṁ tv īśam ayaṁ sukham tatrāpīśa-svarūpānubhavasyaivoru-hetutā dāsādi-van-mano-iñatva-lilāder na tathā matā
When  śānta-rati  (neutral attraction) is continuously existent and mixed with ecstatic emotion, and when the devotee relishes that neutral position, it is called  śānta-bhakti-rasa .  Śānta-bhakti-rasa  devotees generally relish the impersonal feature of the Supreme Personality of Godhead. Since their taste of transcendental bliss is incomplete, it is called  aghana , or not concentrated. A comparison is made between ordinary milk and concentrated milk. When the same devotee goes beyond the impersonal and tastes the service of the Supreme Personality of Godhead in His original form as  sac-cid-ānanda-vigraha , the taste is called concentrated ( ghana ) transcendental bliss. Sometimes the devotees in the  śānta-rasa  relish transcendental bliss after meeting the Supreme Personality of Godhead, but this is not comparable to the transcendental bliss relished by the devotees situated in  dāsya-rasa , the transcendental mellow in which one renders service to the Supreme Personality of Godhead.
Dāsya-rasa, or dāsya-bhakti-rasa, is described in Bhakti-rasāmṛta-sindhu  (3.2.4,5) as follows:
ātmocitair vibhāvādyaiḥ prītir āsvādanīyatām nītā cetasi bhaktānāṁ prīti-bhakti-raso mataḥ
anugrāhyasya dāsatvāl lālyatvād apy ayaṁ dvidhā bhidyate sambhrama-prīto gaurava-prīta ity api
When according to the desires of the spirit soul the living entity develops love for the Supreme Personality of Godhead, this beginning of love is called  dāsya-bhakti-rasa .  Dāsya-bhakti-rasa  is divided into two categories called  sambhrama-dāsya  and  gaurava-dāsya . In the  sambhrama-dāsya , the devotee renders respectful service to the Supreme Personality of Godhead, but in the more advanced  gaurava-dāsya , his service takes the form of giving protection to the Lord.
Sakhya-bhakti-rasa is described as follows in  Bhakti-rasāmṛṭa sindhu  (3.3.1):
st  tāyibhāvo vibhāvādyaiḥ sakhyam ātmocitair iha