Dios aprieta, pero no ahorca. Many a true word is spoken in jest. Entre broma y broma, la verdad se asoma. Once in a while never hurt anyone. M s discurre un hambriento que cien letrados.
Poverty is the mother of all arts.
Favor con favor se paga. If you scratch my back, I'll scratch yours. Gallina vieja hace buen caldo. There's many a good tune played on an old fiddle. De mala mata, nunca buena zarza.