The complete functional activities of a pure devotee are always engaged in the service of the Lord, and thus the pure devotees exchange feelings of ecstasy between themselves and relish transcendental bliss. This transcendental bliss is experienced even in the stage of devotional practice (sadhana-avastha), if properly undertaken under the guidance of a bona fide spiritual master. And in the mature stage the developed transcendental feeling culminates in realization of the particular relationship with the Lord by which a living entity is originally constituted.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 2.3.12, Purport
The Lord of Gokula, Krsna, is the transcendental Supreme Godhead, the own Self of eternal ecstasies. He is the superior of all superiors. He is busily engaged in the enjoyments of the transcendental realm and has no association with His mundane potency.
Lord Brahma
Brahma-samhita 5.6
The one Supreme Personality of Godhead is eternally engaged in many, many transcendental forms in relationships with His unalloyed devotees.
Purusa-bodhini Upanisad
Every day hundreds and millions of living entities go to the kingdom of death. Still, those who remain aspire for a permanent situation. What could be more wonderful than this?
Yudhisthira Maharaja
Mahabharata, Vana-parva 313.116
The blessed Lord Siva becomes all the more blessed by bearing on his head the holy waters of the Ganges, which has its source in the water that has washed the Lord's [Visnu's] lotus feet. The Lord's feet act like thunderbolts hurled to shatter the mountain of sin stored in the mind of the meditating devotee. One should therefore meditate on the lotus feet of the Lord for a long time.
Lord Kapila
Srimad-Bhagavatam 3.28.22
The Absolute Truth is Govinda [Krsna], who has an eternal form of bliss and knowledge and who is sitting beneath the shady trees of Vrndavana.
Gopala-tapani Upanisad
One can overcome the path of birth and death only by understanding the Supreme Personality of Godhead.
Svetasvatara Upanisad 3.