You can't go wrong with Whitman

 

The barista apologises as she slides over my drink.

 "Sorry! I didn't manage a design!"

"Oh, but look," I say, pointing to the faint skim milk outlines on the surface of my coffee.  "There's a very delicate image..."

"It looks just like the lighthouse," adds the woman standing next to me, who has just collected her breakfast in a brown bag.  (She names the lighthouse, but my brain doesn't catch it.)

"I saw a old man waving a cane." I'm rotating the cup.

We all laugh, and I return to my favourite table, calling back over my shoulder, "You see?  You contain multitudes."

I'm not sure that's the best quote, but it sounds profound.