Sac, cid, ānanda—three, three spiritual divisions. Not division actually; they are one. But for our understanding we analyze in that way, sac, cid, ānanda. Sat. Sat means eternity. Brahman realization, impersonal Brahman realization, is realization of eternity; Paramātmā realization means eternity and knowledge; and Bhagavān realization means full realization: eternity, knowledge and bliss.
Simple eternal realization is without factual knowledge and without bliss—impersonal. The impersonalist, they cannot enjoy the transcendental bliss. They simply stay as eternal. That's all. Śānta-rasa. It is called śānta-rasa, peaceful śānta-rasa. There is no exchange. And further development is dāsya-rasa. And further development is sākhya-rasa. And further development is vātsalya-rasa. And further, ultimate development is mādhurya-rasa.
So in the spiritual atmosphere there are different degrees of realization. So this Brahman realization is the first step, and the Paramātmā realization is the second step, and Bhagavān realization, the Supreme Personality of Godhead, that is the ultimate stage.
He's giving some evidences from Śrīmad-Bhāgavatam and Bhagavad-gītā also:
- kṛṣṇam enam avehi tvam
- ātmānam akhilātmanām
- jagad-dhitāya so'py atra
- dehīvābhāti māyayā
- (CC Madhya 20.162)
Now, in Śrīmad-Bhāgavatam some advanced devotee is indicating Kṛṣṇa, kṛṣṇam enam avehi: "This Kṛṣṇa . . ." When Kṛṣṇa was present in person, many persons studied Him in a different way. But one of them, who is pure devotee, he is describing about Kṛṣṇa that enam, "This Kṛṣṇa, this Kṛṣṇa," kṛṣṇam enam avehi, "you should try to understand." What is that? Tvam ātmānam akhilātmanām. Ātmānam akhilātmanām. Ātmā means the self, or soul.