The companionship of one’s wife is no article of merchandise, that, after it has been bought, may be returned, or bartered, or changed; for it is an inseparable accident that lasts as long as life lasts; it is a noose that, once you put it round your neck, turns into a Gordian knot, which, if the scythe of Death does not cut it, there is no untying.
Don Quixote thanked him, and ate a little, and Sancho a good deal, and then they both lay down to sleep, leaving those two inseparable friends and comrades, Rocinante and Dapple, to their own devices and to feed unrestrained upon the abundant grass with which the meadow was furnished.
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They are inseparable companions.
The Chinese think of Taiwan as an inseparable part of their country.