Some people say that eternal bliss is a fanciful myth, but eternal bliss is actually our true nature, and realisation of this, which DOES actually result in eternal bliss, is the entire point of the non-dual teachings.
If someone says this eternal bliss is not possible, it just means they have not found it themselves, not that it is not possible.
All the great sages testified that eternal bliss is our true nature and is the fruit of liberation, and to discover it, and thus also end all suffering, we must turn within.
Anything less than this eternal bliss will not satisfy us, and seeking (and suffering) will necessarily continue.
Anything less than eternal bliss means we have not truly discovered what the term ‘non-duality’ points to, and that we are still engaging, however subtly, on the mental/intellectual realm, where ego and suffering continue to (apparently) exist.
See what Ramana says here, in Guru Vachaka Kovai:
1062. The ever-present Self, the radiant
Gem, this is the rarest, richest
Treasure. Look within and find
And hold it fast. Your penury,
The grand illusion, source of every
Trouble on earth, will vanish forthwith.
1063. Not knowing the value of this treasure,
Their own by birthright, people perish
Through mere sloth. The great ones who
Have found the clue and traced and gained it,
They enjoy eternal bliss.
~ Sri Ramana Maharshi, Guru Vachaka Kovai, verses 1062 and 1063
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