Ok I will look for the exact strip and send it in, but basically after Superman is brought back from the dead Bruce Wayne corners him and questions how he managed it. The dialogue entails Batman telling him that this is unnatural because he has managed to grasp concepts of theortical quantum physics, and also magic which is generally other-dimension science, but cannot understand this feat. Also it is stated by Mr Fantastic in comics which I do not unfortunately own.. but you can see it for yourself on his biography in wikipedia.
Link: - http://en.wikipedia.org/wiki/Mr_Fantastic
extract: - He has admitted, on more then one occasion, to being incapable of understanding magic, as he cannot begin to fathom an aspect of science (as he calls it) that is not based in quantifiable laws and rules.
That is what magic is based on and there is no reason why it would even be a limitation that DD could not overcome.