So you're not absolutely certain. The probability you assign to "Today is Friday" is, oh, nine nines, not 1.
Nope. I assign it the probability of 1.
On the other hand, you think I'm mistaken about that.
On the third tentacle I think you are mistaken because, among other things, my mind does not assign probabilities like 0.999999999 -- it's not capable of such granularity. My wetware rounds such numbers and so assigns the probability of 1 to the statement that today is Friday.
Another month has passed and here is a new rationality quotes thread. The usual rules are: