Yes, obviously. It's meant to be consumed in context of knowing what good is. If you're lacking that context, don't use that single quote to guide your life choices.

..or you could read Meditations where Aurelius does explain what it is to be a good man.

I’ve read it and found it to be sanctimonious apologia for the exercise of violent domination. Epictetus is more tolerable. The better example is the Buddhist tradition, where a figure of comparable authority to Aurelius abandoned power in pursuit of monasticism and universal respect for all life.