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 RumsfeldIt is the photographs that gives one the vivid realization of what actually took place. (On photographs from Abu Ghraib prison.)
Donald RumsfeldIf a prospective Presidential approach can't be explained clearly enough to be understood well, it probably hasn't been thought through well enough. If not well understood by the American people, it probably won't 'sail' anyway. Send it back for further thought.
Donald RumsfeldIf a person is determined to fight to the death, then they may very well have that opportunity.
Donald Rumsfeld