"Marriage," Swan repeated, marveling at the word. To her it was a concept from the Middle Ages, from old Earth--an idea with a strong whiff of patriarchy and property. Not meant for space, not meant for longevity. One moved through one's life in epochs, each a stage in one's history, lasting some few or several years, and then circumstances changed and you were in a new life, with new associates. That could not be altered, not if you were out there riding the great merry-go-round; and so to deform one's life in the attempt to make a relation last longer than its natural term was to risk wrecking its end, such that it splintered back along its whole length and left a bitter wound and a sense that it had all been a lie, where really there should only be a passing on, in one of the little death-and-transfigurations of one's epochs. That's just the way it was."