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> In theory there’s no difference between theory and practice, in practice there is.

love this :)

I prefer: The only difference between theory and practice is that in theory there is no difference between theory and practice.

I've always liked this version best: "The difference between practice and theory is greater in practice than it is in theory."

My favorite version is "The difference between theory and practice is small in theory and large in practice."

Yogi's finest.

It seems that this quote predates Yogi, with a known usage in 1882: https://quoteinvestigator.com/2018/04/14/theory