| | In Post 17, I wrote, "But, again, my point was not that a unicorn qua mythical creature might exist in reality, but that a creature resembling a unicorn might exist in reality. Would you still say you are certain that even that is not true?"
In post 19, Teresa replied, Yes, because as you've already pointed out, conditions on Mars are not conducive to anything mammalian, thus, I know nothing remotely unicornish could exist there. :) Of course, but that was not my question. My question was, would you still say you are certain that it is not the case that a creature resembling a unicorn might exist in reality? In other words, are you still certain that no such creature could exist anywhere else in the universe?
In Post 24, Linda replied, Personally, while I agree with you, Teresa, I would not use the word "know". I would say "I'm certain". Because you don't actually know this, at least not as I use the word "know". Later, in Post 28, she explained her meaning as follows: "To me, certainty is more like belief than it is like knowledge. I'm certain that my father-in-law voted for McCain because of things he has said to me, but I don't know that he did."
Oh, I see. You're using the word "certain" to be mean the same thing as "pretty sure." I'm pretty sure my father-in-law voted for McCain, but I don't know for a fact that he did."
But by "certain," we (Objectivists) don't simply mean pretty sure. We mean absolutely certain. You wouldn't say that you're "absolutely certain that your father-in-law voted for McCain, but that you nevertheless don't know that he did," would you?
Equating certainty with knowledge is also the generally accepted philosophical meaning of "certain." As they use the term "certain," philosophers (and not just Objectivists) imply a claim to knowledge. If I claim certainty that it's going to rain tomorrow, I'm claiming to know that it's going to rain tomorrow. If I were not willing to claim that I know it's going to rain, then I wouldn't say that I'm certain of it. At best, I'd say I'm 99% certain, or that there is a 99% probability of rain. Certainty is 100% probability.
- Bill
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