In true marriage lies / Nor equal, nor unequal: 15 each fulfils / Defect in each, and always thought in thought, / Purpose in purpose, will in will, they grow, / The single pure and perfect animal, / The two-cell'd heart beating, with one full stroke, / Life. Tennyson.

In turbas et discordias pessimo cuique plurima vis—In seasons of tumult and discord, the worst men have the greatest power. Tac.

In unoquoque virorum bonorum habitat Deus—God has his dwelling within every good man. Sen.

In usum Delphini—For the use of the Dauphin.

In utero—In the womb.

In utramvis dormire aurem—To sleep on both 20 ears, i.e., soundly, as no longer needing to keep awake. Pr.

In utraque fortuna paratus—Prepared in any change of fortune. M.

In utroque fidelis—Faithful in both. M.

In vacuo—In empty space.

In vain do they talk of happiness who never subdued an impulse in obedience to a principle. Horace Mann.