There's another way to phrase that and that is that the absence of evidence is not the evidence of absence. It is basically saying the same thing in a different way. Simply because you do not have evidence that something does exist does not mean that you have evidence that it doesn't exist.
Donald RumsfeldControl your time. If you're working off your in-box, you're working off the priorities of others. Be sure the staff is working on what you move to them from the President, or the President will be reacting, not leading.
Donald Rumsfeld