One advantage of marriage is that when you fall out of love with him or he falls out of love with you, it keeps you together until you fall in again.

Viorst’s line treats marriage less as a perpetual state of romantic intensity than as a durable social and emotional structure. The “advantage” is ironic: marriage can outlast the ebb of infatuation, providing continuity—shared obligations, history, and commitment—during periods when feelings cool or conflict arises. The quote suggests that love in long partnerships is cyclical rather than linear; people may “fall out” and later “fall in” again. Its significance lies in reframing marital success as persistence through ordinary fluctuations, implying that stability can create the conditions for affection to return rather than demanding constant passion as proof of a relationship’s worth.