Let’s break down Meditations 3.12
“If you complete the present work, following the rule of right, earnestly, with all your might, with kindness, and admit no side issue, but preserve your own divinity pure and erect, you have at this moment to restore it;”
If you do what is right and in line with your values with every effort in the interest of others with no expectations or ulterior motives you maintain your dignity, integrity and character.
“ if you make this secure, expecting nothing and avoiding nothing, but content with present action in accord with Nature and with heroic truth in what you mean and say, you will live the blessed life. “
You take these actions not got external gratification or expectations but un line with your character and values. Be authentic in what you do or say.
“you will live the blessed life Now there is no one who is able to prevent this.”
A blessed life, In Stoic principle this means a life of fulfillment and peace. When this is achieved no one and nothing can change this.
A blessed life means peace and serenity. It also means happiness.