I can't find the quote, but I remember Mark Twain describing his training as a Mississippi River pilot. The master pilot training him said something like "What

I can't find the quote, but I remember Mark Twain describing his training as a Mississippi River pilot. The master pilot training him said something like "What was the water depth at So and So crossing at mid day three trips back?" When Twain said he didn't remember, the master said "You would, if you didn't read all the time."