In the same way an emerald or gold or purple might always proclaim:
'Whatever anyone does or says, I must be what I am and show my true colours.'"
-Marcus Aurelius, Meditations, 7.15
The Stoics believed that every person, animal, and thing has a purpose or a place in nature. Even in ancient Greek and Roman times, they vaguely understood that the world was composed of millions of tiny atoms. It was this idea - this sense of an interconnected cosmos - part of a larger system. Everyone had a job - specific duty. Even people who did bad things - they were doing their job of being evil because evil is a part of life.
The most critical part of this belief that you, the student who has sought out Stoicism, have the most important job: to be good! To be wise.
"To remain the person that philosophy wished to make us."
Do your job today. Whatever happens, whatever other people's jobs happen to be, do yours. Be good.