Hi everyone I was in philosophy class today and my professor was going over what he said was a paradox with E=mc^2. He said that as defined energy is the ability to do work and that it does work on matter and in turn the work done on the matter creates energy in a cyclic process. The professor argued that there had to be a starting point and he used this as a way to suggest that the metaphysical may be a useful explanation for the start of the energy mass cycle. I disagree with the metaphysical being a viable explanation but i didnt know what to say that would just be open to him calling my logic regressive. I know about the singularity and the theory that branes collide to cause singularities and the inflationary theory. could anyone shed some light on what they would have said to my professor, this "paradox" is weighing heavily on my mind. Thanks to anyone who responds.