Marcus Aurelius
Meditations 1.15
From Maximus I learned self-government, and not to be led aside by anything; and cheerfulness in all circumstances, as well as in illness; and a just admixture in the moral character of sweetness and dignity, and to do what was set before me without complaining. I observed that everybody believed that he thought as he spoke, and that in all that he did he never had any bad intention; and he never showed amazement and surprise, and was never in a hurry, and never put off doing a thing, nor was perplexed nor dejected, nor did he ever laugh to disguise his vexation, nor, on the other hand, was he ever passionate or suspicious. He was accustomed to do acts of beneficence, and was ready to forgive, and was free from all falsehood; and he presented the appearance of a man who could not be diverted from right, rather than of a man who had been improved. I observed, too, that no man could ever think that he was despised by Maximus, or ever venture to think himself a better man. He had also the art of being humorous in an agreeable way.
Marcus Aurelius, Meditations 1.15, translated by George Long
From Maximus, self-mastery and stability of purpose; and cheeriness in sickness as well as in all other circumstances; and a character justly proportioned of sweetness and gravity; and to perform without grumbling the task that lies to one's hand.
And the confidence of every one in him that what he said was also what he thought, and that what he did was done with no ill intent. And not to shew surprise, and not to be daunted; never to be hurried, or hold back, or be at a loss, or downcast, or smile a forced smile, or, again, be ill-tempered or suspicious.
And beneficence and placability and veracity; and to give the impression of a man who cannot deviate from the right way rather than of one who is kept in it; and that no one could have thought himself looked down upon by him, or could go so far as to imagine himself a better man than he; and to keep pleasantry within due bounds.
Marcus Aurelius, Meditations 1.15, translated by C. R. Haines