Marcus explores and substantiates his assertion that injustice is against nature, also the sin of omission (for example failing to teach someone their error is our sin), and that we are all naturally reasonable creatures, but that we forget this. He believes it is our actions and what we do that matters, and in our deeds we must recognise that we are part of a society. He also alludes to a personal dislike of politicians: http://goo.gl/L7NWlY