Scott: I am bad at math.

Jonah: You are good at math.

Scott: No, I really am bad at math.

Jonah: No, you really are good at math.

Nisan: Esteemed colleagues, it is no use! If you continue this exchange, Scott will continue to believe they are bad at math, and Jonah will continue to disagree — forever!

Scott: Thank you for the information, but I still believe I am bad at math.

Jonah: And I still believe Scott is good at math.

Scott: And I still believe I am bad at math.

Nisan: Esteemed colleagues, give it up! Even if you persist in this exchange, neither of you will change your stated beliefs. In fact, I could truthfully repeat my previous sentence a hundred times (including the first time), and Scott would still believe they are bad at math, and Jonah would still disagree.

Scott: That's good to know, but for better or for worse, I still believe I am bad at math.

Jonah: And I still believe Scott is good at math.

Scott: Ah, but now I realize I am good at math after all!

Jonah: I agree, and what's more, I now know exactly how good at math Scott is!

Scott: And now I know that as well.