Enchiridion 12

If you wish to make progress, dismiss all reasoning of this sort: "If I neglect my affairs, I shall have nothing to live on." "If I do not punish my slave-boy he will turn out bad." For it is better to die of hunger, but in a state of freedom from grief and fear, than to live in plenty, but troubled in mind. And it is better for your slave-boy to be bad than for you to be unhappy. Begin, therefore, with the little things. Your paltry oil gets spilled, your miserable wine stolen; say to yourself, "This is the price paid for a calm spirit, this the price for peace of mind." Nothing is got without a price. And when you call your slave-boy, bear in mind that it is possible he may not heed you, and again, that even if he does heed, he may not do what you want done. But he is not in so happy a condition that your peace of mind depends upon him.

Epictetus, Enchiridion 12, translated by W. A. Oldfather

If you intend to improve, throw away such thoughts as these: if I neglect my affairs, I shall not have the means of living: unless I chastise my slave, he will be bad. For it is better to die of hunger and so to be released from grief and fear than to live in abundance with perturbation; and it is better for your slave to be bad than for you to be unhappy. Begin then from little things. Is the oil spilled? Is a little wine stolen? Say on the occasion, at such price is sold freedom from perturbation; at such price is sold tranquillity, but nothing is got for nothing. And when you call your slave, consider that it is possible that he does not hear; and if he does hear, that he will do nothing which you wish. But matters are not so well with him, but altogether well with you, that it should be in his power for you to be not disturbed.

Epictetus, Enchiridion 12, translated by George Long

If you wish to make progress, abandon reasonings of this sort: 'If I neglect my affairs I shall have nothing to live on'; 'If I do not punish my son, he will be wicked.' For it is better to die of hunger, so that you be free from pain and free from fear, than to live in plenty and be troubled in mind. It is better for your son to be wicked than for you to be miserable. Wherefore begin with little things. Is your drop of oil spilt? Is your sup of wine stolen? Say to yourself, 'This is the price paid for freedom from passion, this is the price of a quiet mind.' Nothing can be had without a price. When you call your slave-boy, reflect that he may not be able to hear you, and if he hears you, he may not be able to do anything you want. But he is not so well off that it rests with him to give you peace of mind.

Epictetus, Enchiridion 12, translated by P. E. Matheson