in reply to
Re^3: Worst blog post ever on teaching programming
in thread Problematic post on teaching programming
The quote I heard was:
In theory, theory is the same as practice. In practice, it's not.
attributed to Yogi Berra.
merlyn likes to give an alternative phrasing:
The difference between theory and practice in theory is much less
than the difference between theory and practice in practice.
— e.g. in this clpm post
Results (195 votes),