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"Never be judgemental with respect to a free gift, as the vulgar proverb: to look gift-horse in the mouth." 
[Noli de gratuito munere judicare, et, ut vulgare proverbium est : Equi dentes inspicere donati.]
Saint Jerome, Preface to The Commentaries on the Epistle of the Apostle Paul to the Ephesians, c. 400.

Kainé embraced the young mermaid who, since her nurture through NieR, envisions a happy Yonah life.

"My girl, nothing could be closer to death than a mouse with only one hole. A soul alone neither sings 
nor weeps. A single act doesn't make a habit. You will rarely see a friar walk alone. It is a miracle if 
a partridge flies alone. Always eat the same food and you will soon get bored. One swallow does not 
make a summer. A single witness is no sufficient proof. If you have only one coat, it soon gets shabby."

[No hay cosa más perdida que el mur que no sabe sino un horado, Una ánima sola ni canta ni llora, 
Un solo acto no hace hábito, Un fraile solo, pocas veces lo encontrarás en la calle, Una perdiz sola, 
por maravilla vuela, Un manjar solo contino, presto pone hastío, Una golondrina no hace verano, 
Un testigo solo no es entera fe, Quien sola un ropa tiene, presto la envejece.]

Fernando de Rojas, La Celestina, Act VII, 1499 [Celestina with nine proverbs emphasizes singularity.]