I grok, therefore I am. To 'Grok' is to develop a deep understanding of something in an intuitive way - so that it becomes at oneness with oneself. (Thanks, Wikpipedia). -Blink- the new book by Malcom Gadwell, in a sense, makes the same argument.
concerning a quick understanding that captures the essence completely but in a cruciform fashion..."just the facts, ma'am."
Grok is supposed to be a Martian word - in the mind of the writer Robert Heinlein (now deceased)whom you may know best as the creator of the story Starship Troopers which became a Hollywood movie about a dystopic future.
What's the difference, not all that much...