Thank you.
Earth is a mechanism by which a being might have consciousness? I don't understand.
No, Earth is proof that such mechanisms exist in our universe.
You said previously that believing that anything is possible is rational. Then you said that believing it possible that a person can fly is irrational.
You will have to show me the quote.
Correct. It is possible that gravity doesn't work in some places. Therefore, belief that it is possible that gravity doesn't work in some places is rational. Furthermore, one can be of the opinion that gravity doesn't work in some places without being necessarily irrational, because one might have a good reason to believe it.
No. There might be demons under my bed but believing that there are demons under my bed is irrational. Your logic just doesn't work Bri.
Counter to all evidence that you know of, you mean. Therefore, it is rational for you to believe that a person can levitate since you don't have any evidence of it. However, it is possible that someone else believes that a person can levitate because they have evidence that you don't know about. I personally wouldn't say that such evidence cannot possibly be enough to make their belief rational without knowing their evidence. In other words, they may very well have a good reason for believing as they do, making their belief rational.
We have an enormous data base. It is irrational to believe that someone can do something counter to the laws of physics as we understand them without,
1.) Any evidence.
2.) Any known mechanism for it to happen.
So, there is no amount of evidence that would cause you to doubt gravity?
Of course there is. And there is an amount of evidence that would cause me to believe in Santa Claus. Absent the evidence, if I believed in him I would be irrational
If you were presented with irrefutable evidence, would you admit that people who chose to doubt gravity because they saw the evidence before you were not irrational after all? Your assertion that "logic and reason compel reasonable people to not doubt gravity" seems to be only an opinion and not fact.
See, this is where this gets frustrating. You know my answer. OF COURSE. I hold all beliefs provisionally.
"Opinion and not fact"? I don't think in such absolutes. Having been tested trillions upon trillions of times gravity always works the same way that we know of. It is predictable. It is testable. It is falsifiable. It can be understood mathematicaly. Using the law of gravity (and other things) we can pinpoint a trajectory to the Moon. If the law of gravity was not a constant then our world would be very different. It is irrational to dismiss all of the known evidence for the possibility of the unknown. THAT is why it is irrational.
I never claimed that one should reject gravity (or anything else) simply because of lack of absolute proof. Quite the opposite, an opinion about something without absolute proof might certainly be rational. For example, an opinion that gravity doesn't hold in all cases might be rational, particularly if one had a good reason for holding such an opinion.
And that's the point. We don't have a "good reason". You can't name one. Bri, this goes to my argument, lacking a "good reason" a belief that gravity is not constant is irrational. To what degree it is irrational I can't say.
Lacking a "good reason", a belief that prayer can alter an outcome is irrational. To what degree I can't say. You would have to take it on a case by case basis.
What is the understood mechanism that explains intelligence on Earth (much less outside of our solar system)?
Please see
abiogenesis,
evolution (pay particular attention to
natural selection),
Evolutionary Neuroscience and finally
Evolution and the cognitive neuroscience of awareness, consciousness and language.
We don't understand the mechanism of intelligent life here on Earth...
This is just false. But let's be accurate, it isn't just a mechanism, it's many mechanisms. We don't completely understand all of them but we do have a very good understanding of many of them.
...much less any mechanism by which we can say that it exists outside of our solar system.
As we explore the universe we find more and more that the likelihood of planets like ours is increasing. It is reasonable to infer that the mechanisms here on Earth (see above) exist in other places.
By your criteria, it is irrational to hold an opinion that intelligent life exists outside of our solar system since there is no known mechanism by which intelligent life exists and there is no empirical evidence that it exists outside of our solar system.
Not at all, please reference the above links.
There is also no mechanism and no evidence of intelligent life outside of our solar system.
False, please see links above.
I said that it isn't necessarily irrational.
But it is. A person who refused to leave his home for fear of floating away is irrational
Additionally, your introduction of phobias just muddies the water.
Actually no, it clarifies it very well. As we shall see shortly.
A fear is rational if it balances the chances of the event occurring and the potential consequences of the event occurring.

Thank you. Yes, a belief is irrational if it balances the chances of the event occurring and the potential consequence or benefit of the event occurring and it choses the less likely over the more likely. The greater the difference the more irrational.
I accept your definition. Again, many thanks.
As far as gravity is concerned, if someone has reason to believe that gravity will fail, then that belief might be rational as might be their fears. If their reasons for believing that gravity will fail are weak, then their fears should be proportionally mild. I don't believe it likely at all that gravity will fail (even though I know it is possible) and therefore whatever fear I might have is extremely weak at best.
Please see your definition. I accept that irrationality can be measured in degrees. I'm not sure how it is or should be measured.
How about this, the less likely an event is to occur and the more a person believes in the event the more irrational the belief, sound good?
Uhhh...yes, we have to admit that gravity might not be constant. It is a fact that gravity actually might not be constant! A belief that gravity might not be constant is rational. If one had reason to be of the opinion that gravity isn't constant, then that opinion might also be rational.
The more a person believes that he or she might at any moment start to levitate the more irrational that person is.
If the belief that gravity would fail was based on a particular reason that proved to be true, then indeed that belief would have been rational all along.
Please to name this reason. Absent a reason then it is irrational.
Your fear of something that is possible should be proportionate to the reasons you have for it and the potential consequences of it occurring.
I concur with two edits. Your belief of something that is possible should be proportionate to the reasons you have for it and the potential consequences or benefits of it occurring.
Therapists cannot simply assume that the patient has a reason to fear that there are demons living under his or her bed. If after questioning the therapist finds that there is no such reason then it is a reasonable conclusion that the fear is irrational.
Lacking a reason that prayer works, by your own definition, we must conclude that it is irrational.
I think we are making progress, thanks Bri.