In e =mc^ einstein s equation the e is energy and m is mass and c is speed of light, squared. It ahows the relation of energy with mass times the speed of light as the speed of light is constant.
Ot basiclly says that enery and mass are the same thing!!. Energy is mass compressed veey highly to make the energy solid!!
Benvolio thinks that Romeo should go to the Capulet party, if only to see all of the beautiful girls. He should forget Rosaline and allow his eyes to wander freely. By giving liberty unto thine eyes.