the hills -- and you yourself are particularly prone to this yearning.
But all this is quite unphilosophic, when it is open to you, at any
time you want, to retreat into yourself. No retreat offers someone
more quiet and relaxation than that into his own mind, especially if
he can dip into thoughts there which put him at immediate and complete
ease: and by ease I simply mean a well-ordered life. So constantly
give yourself this retreat, and renew yourself. The doctrines you will
visit there should be few and fundamental, sufficient at one meeting
to wash away all your pain and send you back free of resentment at
what you must rejoin."
Marcus Aurelius, Meditations, Penguin Kindle edition, 2006