What are some questions we'll never know the answer to?

Ostensibly God already answered the only question we wouldn’t know the answer to when he created existence!

God was asking: ‘What is nothing?’ ‘How can it be nothing?’ ‘What is divine about nothing?’ Etc.

Asking questions about nothing with a lot of power is like creating reality.

Alternately, you might believe that reality is eternal and the nature of consciousness is the unsolved question.

However, it is possible to see that consciousness is a means to an end to some extent. Highly expensive, often slightly disappointing.

As soon as consciousness seems to become cheap, it bears fruit. At that point we can define consciousness as paradoxical.

To the primitive tool-building brain all that consciousness needs is a reason to live, and some form of technicalism to mull into thoughts, or some equivalent thing to turn into emotions, or both, etc.

At this point you may find it is easier to understand consciousness.

Consciousness is holy, so far as that is possible. It is also an attempt to process the worst problems, and to find the best solutions.

I think I have heard someone define it as ‘a holy paradox’. Other definitions could be proposed, often relating to the soul, transformation, attributes, powers, and modes of existence.