It's how you use the energy at your disposal that matters most, not simply the quantity you can spend.

For example: powered aerodynamic flight, the internet, the development of language -- none of these things involved significant changes in Humanity's available energy. Yet they spawned profound changes in our civilization, by the clever ways in which we directed the existing forces.

I'm not saying the Kardashev Scale is invalid, only that it feels like 19th-Century thinking applied to a future that may involve very different success criteria.

If we're going to reach the stars in a useful way, I believe we'll have to dance with the forces of nature, not beat them over the head with a hammer of raw power.

So, in my mind, what the original poster called spirituality is absolutely central to our evolution. It may not be a religious thing, but it would involve a subtle and deep partnership with reality on many levels.

A future where spirituality take a more important place, a future where everyone could develop mental abilities that could replace computers, a future where life could reach an incredible power...

I'm not saying the Kardashev Scale is invalid, only that it feels like 19th-Century thinking applied to a future that may involve very different success criteria.

It's how you use the energy at your disposal that matters most, not simply the quantity you can spend.

So, in my mind, what the original poster called spirituality is absolutely central to our evolution.

The notion of spirituality is difficult to apprehend, and I think we could oppose spirituality to materialism. Spirituality could be the way of using forces and energies that occur deep in human nature instead of in our engines, natural or supernatural.

Sometimes I imagine that all the UFO we have seen are just spiritual projections of aliens visiting our world.

Spirituality could be the way of using forces and energies that occur deep in human nature instead of in our engines, natural or supernatural.

I would say that I do not agree that this "spiritual" aspect of reality even exists.

I say, let's not just close the discussion in a vicious circle of the existence problem, that would be very cruel to all believers.

And almost all the UFOs that have been reported have been proven to be mundane things or hoaxes.

The scientist's duty is to explore and to study everything that is unknown

Yes, almost all

I hope that, in the future, science and art will melt together, and we will became conscious of our nature and its forces...

But I am saying that I see no reason to conclude that a "spiritual" side of nature does exist

Around 100 years ago, spirituality was called "witchcraft" by scientists, and then they discovered quantum mechanics, that allows a lot of facts that was unimaginable before.

Now we know that quantic delocalisation is omnipresent in our metabolism, and that we can create the effects of a molecule without creating it.

And therefore I must absolutely dismiss it from the discussion.

Technically, there's no spiritual future of humanity at all

a future where everyone could develop mental abilities that could replace computers, a future where life could reach an incredible power...

The question of spirituality is like the question of a creator: it is certainly a possibility, but as facts about it are presently unknowable it cannot be seriously discussed except in a hypothetical manner.