All of life is a balancing act.  The key to keeping your balance is not to have one side carry more weight than the other.  Making sure you distribute your time and resources in a balanced way in order to avoid letting one side get to heavy is more art than science.  However you should actively focus on keeping this balance, since it will not happen on its own.  Sometimes you have to say no to an are in your life that demands to much time an resources.