Here is a beautiful verse which encapsulates the nature of bliss within our scriptures.
आनन्दो ब्रह्मेति व्यजानात्।
आनन्दाध्येव खल्विमानि भूतानि जायन्ते।
आनन्देन जातानि जीवन्ति। आनन्दं प्रयन्त्यभिसंविशन्तीति। तैत्तिरीयोपनिषत् ३.६
ānando brahmeti vyajānāt |
ānandādhyeva khalvimāni bhūtāni jāyante |
ānandena jātāni jīvanti | ānandaṁ prayantyabhisaṁviśantīti | taittirīyopaniṣat 3.6
He perceived that bliss as Brahman, from that bliss beings are born; by bliss, when born, they live; into bliss they enter at dissolution.
Bliss or ānanda is the complete culmination of all spiritual aspirations. The pursuit of ānanda by the regulative principles handed down by the ancient scriptures conclude that ānanda is the culmination of all pursuits. This according to the taittirīyopaniṣat is the supreme knowledge of Brahman realised by Varuna and taught to Bhrigu.