That's not what the Ea are saying, though. Let's have a closer look.

'If you understand this - understand aught of our tale - you will abandon your quest for knowledge. Ignorance is truly bliss. If you would cling to your illusory happiness, remain primitive and pure. It is the only way.'

The Ea believe that if they hadn't have discovered the truth, they could have been happy. The central ideal around which they built their society on was the pursuit of knowledge. Their despair was that their ideal was meaningless.

And Y'shtola's counterpoint to that is:

'As you yourself said, the subject matter is beyond my comprehension. And that, I accept, is true. I do not possess the knowledge to prove or disprove your conclusion. In my mortal years, I doubt that I could even approach the wisdom of the Ea. But of one thing I am absolutely certain: I would not be happier in ignorance.

The most important lesson I've learned... is that learning isn't simply passing one's eyes over words. Nay... 'tis when understood for oneself that knowledge attains its true value. And that is what has sustained me. Driven me onward in joy and wonder, in anger and sorrow. The universe may end, and may all be for naught. But I will live as I always have.

I will always seek out new knowledge. And no conclusion of yours, no matter how grim, can dampen my desire.'

And this latter point personally resonates with me.

I find it strange that you'd hold an opinion at all about what any of my beliefs are. Existentialism and Nihilism do force us to confront some interesting questions and assumptions about our belief systems. But you can always find the answers for yourself.