10 For we are God’s handiwork, created in Christ Jesus to do good works,which God prepared in advance for us to do.
From the very beginning, make it your practice to say every harsh impression, "you are an impression and not at all what you appear to be." Next, examine and test it by the rules you possess, the first and greatest of which is this- whether it belongs to the things in our control or not in our control, and if the latter, be prepared to respond, "It is nothing to me."
—Epictetus, Enchiridion, 1.5(resource) The Daily Stoic: 366 Meditations on Wisdom
I will keep constant watch over myself and- most usefully- will put each day up for review. For this is what makes us evil- that none of us looks back upon our own lives. We reflect upon only that which we are about to do. And yet our plans for the future descend from the past.
—Seneca, Moral Letters, 83.2—
What's left to be prized? This, I think -- to limit our action or inaction to only what's in keeping with the needs of our own preparation... it's what the exertions of education and teaching are all about -- here is the thing to be prized! If you hold this firmly, you'll stop trying to get yourself all the other things... If you don't you won't be free, self sufficient, or liberated from passion, but necessarily full of envy, jealousy, and suspicion for any who have the power to take them, and you'll plot against those who do have what you prize... But by having some self respect for your own mind and prizing it, you will please yourself and be in better harmony with your fellow human beings, and more in tune with the gods- praising everything the have set in order and allotted you.
—Marcus Aurelius, Meditations,6.16.2b-4a—
I am your teacher an you are learning in my school. My aim is to bring you to completion, unhindered, free from compulsive behavior, unrestrained, without shame, free, flourishing, and happy, looking to God in things great and small - your aim is to learn and diligently practice all these things. Why then don't you complete the work, if you have the right aim and I have both right aim and right preparation? What is missing?... The work is quite feasible and is the only thing in our power... Let go of the past. We must only begin. Believe me and you will see.
— Epictetus, Discourses, 2.19.29-34 —