We are playing a game

The game runs like this :

the only thing you really know

is what you can put into words

Let's suppose I love some girl rapturously

and somebody says to me

Do you really love her

Well how am I going to prove this

They'll say Write poetry

Tell us all how much you love her

Then we'll believe you

So if I'm an artist and can put this into words

and can convince everybody I've written the most ecstatic love letter ever written

they say All right ok we admit it

you really do love her