Reminds me of Sidney Morgenbesser's response when he was asked his opinion of pragmatism: "It's all very well in theory, but it doesn't work in practice."

Grrr... At least with normal 'theory vs practice' quotes they stick to one (slightly broken) definition of theory in which 'theory' is (evidently) limited to oversimplified theories that don't fully account for specific details of practical execution. In this quote it conflates an encompassing definition of theory with the limited, specific caricature of the more typical theory/practice dichotomy presentations. Which is just all sorts of wrong.

Stick to your colloquialisms Yogi Berra! Don't get stuck half way to technical clarity. It's just an insult to all sides!