I can't remember the exchange verbatim, but the way I interpreted it was as a way to cope with the analysis paralysis phenomenon that can occur when one is confronted with a lot of information.
According to Greene's quoted maxim, it is always advisable to act before all the data has been gathered (presumably because one can never gather all the data).
Latest Bloggingheads up with Robert Greene, bestselling author of The 48 Laws of Power and most recently The 50th Law ("Fear nothing").
Excellent commentary/summary by Andy McKenzie here.
The most important piece of advice I got from The 50th Law was "always attack before you are ready".