To keep your marriage brimming, with love in the loving cup, whenever you're wrong admit it; whenever you're right shut up.

In this characteristically witty, rhymed couplet, Nash compresses a piece of marital advice into a comic rule of thumb about ego and harmony. The “loving cup” image suggests marriage as something that must be continually replenished; the practical method he offers is not grand romance but everyday self-management. “Admit it” when wrong points to accountability and repair, while “shut up” when right satirizes the futility of winning arguments at the cost of goodwill. The humor depends on exaggeration—silence is not always virtuous—but the underlying insight is that generosity, tact, and restraint often sustain intimacy better than being technically correct.