People look for retreats for themselves, in the country, by the coast, or in the hills. But this is altogether un-philosophical, when it is possible for you to retreat into yourself at any time you want.
There is nowhere that a person can find a more peaceful and trouble-free retreat than in his own mind, especially if he has within himself the kind of thoughts that let him dip into them and so at once gain complete ease of mind; and by ease of mind, I mean nothing but having one’s own mind in good order.
So constantly give yourself this retreat and renew yourself. You should have to hand concise and fundamental principles, which will be enough, as soon as you encounter them, to cleanse you from all distress and send you back without resentment at the activities to which you return.
– Marcus Aurelius, Meditations, 4.3
“How barbarous, to deny men the privilege of pursuing what they imagine to be their proper concerns and interests!
Yet, in a sense, this is just what you are doing when you allow your indignation to rise at their wrongdoing; for after all, they are only following their own apparent concerns and interests.
You say they are mistaken? Why then, tell them so, and explain it to them, instead of being indignant.”
Marcus Aurelius, Meditations 6:27