Is it arrogant to claim to know the truth?

I had a very frustrating conversation with some dude recently. He kept saying that it's very arrogant for anyone to believe that they know the truth on some matter.

So I asked him, "Really? Do you believe that's true? If so, wouldn't that make you arrogant?"

And yet he kept insisting that he was right. Good grief.

That reminded me of another conversation I had with this other fella once. We were having a discussion on some religious matter, and he said, "Your problem is that you think you're right!"

Um, hello? Of course I think I'm right. Don't we all think that we're right? Only a fool argues for a position that he doesn't truly believe.

Heck, this fella thought he was right in saying that it's wrong to think you're right. Such words may sound profound, but they are profoundly misleading.