When the gods send evil, one cannot escape it.
Life without a design is erratic. As soon as one is in place, principles become necessary. I think you'll concede that nothing is more shameful than uncertain and wavering conduct, and beating a cowardly retreat. This will happen in all our affairs unless we remove the faults that seize and detain our spirits, preventing them from pushing forward and making an all-out effort.
—Seneca, Moral Letters, 95.46(resource) The Daily Stoic: 366 Meditations on Wisdom
Nothing will ever befall me that I will receive with gloom or a bad disposition. I will pay my taxes gladly. Now, all the things which cause complaint or dread are like the taxes of life- things from which, my dear Lucilius, you should never hope for exemption or seek escape.
—Seneca, Moral Letters, 96.2 (resource), Ryan Holiday, The 366 Meditations on Wisdom, Perseverance, and the Art of Living
What is bad luck? Opinion. What are conflict, dispute, blame, accusation, irreverence, and frivolity? they are all opinions, and more than that, they are opinions that lie outside of our own reasoned choice, presented as if they were good or evil. Let a person shift their opinions only to what belongs in the field of their own choice, and I guarantee that person will have peace of mind, whatever is happening around them.
—Epictetus, Discourses, 3.3.18b-19 (resource), Ryan Holiday, The Daily Stoic
Make sure you're not made "Emperor", avoid the imperial stain. It can happen to you, so keep yourself simple, good, pure, saintly, plain, a friend of justice, god-fearing, gracious, affectionate, and strong for your proper work. Fight to remain the person that philosophy wished to make. Revere the gods, and look after each other. Life is short- the fruit of this life is a good character and acts for the common good.
—Marcus Aurelius(resource) Ryan Holiday, The Daily Stoic: 366 Meditations on Wisdom