How we cite our quotes: (Book.Chapter)
Quote #4
Another does wrong. What is that to me? Let him see to it: he has his own disposition, his own action. I have now what universal nature wishes me to have now, and I do what my own nature wishes me to do now. (5.25)
The perception of wrong or evil disturbs the mind and causes unhappiness. Marcus is all about walling off of the mind from external things so that it doesn't judge anything to be good or bad. This clears the way for him to see the thing or event for what it truly is, unclouded by emotion. Marcus is also further comforted with this principle: mind your own beeswax. He knows that each person has his or her own "directing mind" and therefore has a fair chance of responding with reason. If someone doesn't respond with reason, that's his or her own problem. Marcus has to deal with all the stuff on his own philosophical plate.
Quote #5
All things come from that other world, taking their start from that universal governing reason, or in consequence of it. So even the lion's gaping jaws, poison, every kind of mischief are, like thorns or bogs, consequential products of that which is noble and lovely. (6.36)
There's a strange paradox in Marcus' philosophy: you have to accept the horrors of the world as things emanating from the Whole, which somehow has the welfare of the universe as its sole purpose. So while Christians really do need to be persecuted (hence the "lion's gaping jaws") for the greater good of the Roman community, Marcus sees the chaos of violence as the necessary and grisly byproduct of the maintenance of order and calm.
Quote #6
If you set up as good or evil any of the things beyond your control, it necessarily follows that in the occurrence of that evil or the frustration of that good you blame the gods and hate the men who are the real or suspected causes of that occurrence or that frustration...But if we determine that only what lies in our own power is good or evil, there is no reason left us either to charge a god or to take a hostile stance to man. (6.41)
This is another "thinking makes it so" moment. Marcus is determined that nothing should be out of the control of his mind, since self-sufficiency based on reason is of prime concern for him. It is also important for him to keep tabs on his emotions when his goals are thwarted. Lashing out against the gods is a totally antisocial act, one that would cut him off from the universal Whole that is his spiritual and physical home. That would never do.