How do you know?

A conversation between me and my Jewel:

Me: You know I love you, right?

Jewel: Yes, papa. I know you love me.

Me: HOW do you know I love you?

Jewel: How do I know?

Me: Yes, HOW do you know that I love you?

She looks at me with an odd expression. It isn't an expression of confusion, but more the look of someone who thinks the answer is obvious.

Jewel: Because I KNOW you, papa.

I collect myself after a moment.

Me: But you also know that I love you because I bring you bagels to eat, right?

She smiles.

Jewel: Yeah, that's the right answer too, papa.