Men seek for seclusion in the wilderness, by the seashore, or in the mountains – a dream you have cherished only too fondly yourself. But such fancies are wholly unworthy of a philosopher, since at any moment you can choose to retire within yourself. Nowhere can man find a quieter or more untroubled retreat than in his own soul; above all, he who possesses resources in himself, which he need only contemplate to secure immediate ease of mind – the ease that is but another word for a well-ordered spirit. Avail yourself often, then, of this retirement, and so continually renew yourself.
Marcus Aurelius (AD 120 – 180), Meditations (4.3)