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:

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This photo of The Arch of Marcus Aurelius is courtesy of TripAdvisor. According to Girl Solo in Arabia (http://girlsoloinarabia.typepad.com), built in 163 AD in the Greek style, this arch straddles the decumanus maximus and the cardo-maximus in the ancient Roman city of Oea which is now Tripoli. Besides Roman columns re-used in newer buildings in the medina, this is the only existing Roman monument in the city.