Utram bibis? Aquam an undam?

I stumbled upon a quote the other day that I would like you to see. It is from "The Magus" by John Fowles.
It is one of my all time favourite books (and quotes), and therefore I'd love to share it with you.

Utram bibis? Aquam an undam? - What are you drinking? The Water or the Wave?

How do you interpret it?

\John Fowles

The insufficiency of Language

"Those who know, do not speak. Those who speak, do not know..."

\Lao Tzu

Direct and indirect describtion of the psycology of personages

What I was saying. I am one of the only writers who doesn’t try to describe my personages psychologically. I describe them only through their actions, and that is what makes them so much more complex.
You can describe every thought they might have, but you’re bound by the inadequacy of language. What I do is that I describe them – not through language, but – through actions, and that makes the reader experience the fourth dimension, which we talked about today.

That is to be found, especially in The Idiot and The Brothers Karamazov

\Dostojevski