for your part, do not desire to be a general, or a senator, or a consul, but to be free; and the only way to this is a disregard of things which lie … - Epictetus

You know yourself what you are worth in your own eyes; and at what price you will sell yourself. For men sell themselves at various prices. This is why, when Florus was deliberating whether he should appear at Nero's shows, taking part in the performance himself, Agrippinus replied, 'Appear by all means.' And when Florus inquired, 'But why do not you appear?' he answered, 'Because I do not even consider the question.' For the man who has once stooped to consider such questions, and to reckon up the value of external things, is not far from forgetting what manner of man he is.

For human beings, the measure of every action is the impression of the senses.

"If you do not wish to be prone to anger, do not feed the habit; give it nothin which may tend to its increase. At first, keep quiet and count the days when you were not angry: "I used to be angry every day, then every other day: next, every two, then every three days!" and if you succeed in passing thirty days, sacrifice to the gods in thanksgiving."