In response to a question asking him to weigh the relative effectiveness of talks, papers, and books, Dr. Hamming first acknowledged the necessity of each medium before concluding - in the long-haul, books which leave out what's not essential - will be the most valuable.
Knowing it all is well and good but most of the time capturing the essence of the topic is enough.
Footnotes / well, it's actually an endnote, but who cares?
0. Link to the talk...is...
Here!