Here is a quotation regarding theory vs. practice that resonates repeatedly in my
day-to-day activities. It sums up an important
lesson I have learned over the years.
“In theory, there is no difference between
theory and practice. But in practice, there is."
I’ve done some research on this and I am fairly convinced
it should be attributed to Jan L. A. van de Snepscheut, although there are some
who believe it was first said by Yogi Berra. Some links to lists of pithy quotes that include
this one are here, here, here, and here. And a brief Wikipedia biography of Snepscheut is here.