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Śrī Īśopaniṣad
I am the basis of the impersonal  Brahman , which is immortal and imperishable, eternal, the constitutional position of ultimate happiness. ( Gītā , 14/27)
Brahman ,  Paramātman  and  Bhagavān  are three angles of vision of the same Absolute Truth.  Brahman  is the phase of the Absolute Truth most perceptible to the beginner.  Paramātman  is the phase of the Absolute Truth for those who have progressed. And  Bhagavān  is the ultimate realization of the Absolute Truth. This is confirmed in the  Gītā , where the Lord says that He is the ultimate concept of the Absolute Truth. He is the source of  Brahma-jyoti , as well as of the all-pervading  Paramātman  feature.
As He says that He is the ultimate reservoir of the  Brahma-jyoti , or impersonal conception of the Absolute Truth, so also He says in the  Gītā  that there is no need of explaining His unlimited potency: it can be summarized in short that, by His one plenary portion—the all-pervading  Paramātman —He maintains the complete material cosmic creation. And in the Spiritual World also He maintains all manifestations. Therefore, in the  Śruti mantra  of  Śrī Īśopaniṣad , He is addressed as  Pūṣan , the ultimate Maintainer.
The Personality of Godhead, Śrī Kṛṣṇa, is always full with transcendental bliss. When He was present at Vṛndāvana in India 5,000 years ago, He always remained in transcendental bliss, even from the beginning of His childhood pastimes. The killing of varieties of demons, such as Agha, Baka, Pūtanā and Pralamba were also pleasure excursions for Him. When He was within His village He was enjoying with His mother, sisters and friends as the naughty Butter Thief, and everyone of His associates was enjoying celestial bliss by His stealing. The Lord is known as the Butter Thief, but the term is never used in a derogatory sense. The term Butter Thief, in the case of the Lord, is used with the understanding of the pleasure of His pure devotees. Everything that was done by the Lord at Vṛndāvana was for the pleasure of His associates there. Such manifestations were created by Him