Difficulties are things that show a person what they are.Epictetus
“Don't demand that things happen as you wish, but wish that they happen as they do happen, and you will go on well.”
Stoic philosopher · 50 – 135
Epictetus was a Greek-born slave in Rome who won his freedom and became one of the most influential Stoic teachers. His Discourses and the handbook known as the Enchiridion teach that freedom lies in mastering one's own judgments and desires.
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Keep silence for the most part, and speak only when you must, and then briefly.Epictetus
Not every difficult and dangerous thing is suitable for training, but only that which is conducive to success in achieving the object of our effort.Epictetus
It's not what happens to you, but how you react to it that matters.Epictetus

Men are disturbed, not by things, but by the principles and notions which they form concerning things.Epictetus
Nature gave us one tongue and two ears so we could hear twice as much as we speak.Epictetus
The world turns aside to let any man pass who knows where he is going.Epictetus
It is impossible for a man to learn what he thinks he already knows.Epictetus