"Let your occupations be few," says the sage, "if you would lead a tranquil life." - Marcus Aurelius

He who flies from his master is a runaway; but the law is master, and he who breaks the law is a runaway. And he also who is grieved or angry or afraid, is dissatisfied because something has been or is or shall be of the things which are appointed by Him who rules all things, and He is Law, and assigns to every man what is fit. He then who fears or is grieved or is angry is a runaway.

Learn to ask of all actions, “Why are they doing that?” Starting with your own. (Hays translation)

If you do the job in a principled way, with diligence, energy and patience, if you keep yourself free of distractions, and keep the spirit inside you undamaged, as if you might have to give it back at any moment— If you can embrace this without fear or expectation—can find fulfillment in what you're doing now, as Nature intended, and in superhuman truthfulness (every word, every utterance)—then your life will be happy. (Hays translation)—