no es oro todo lo que reluce

all that glitters is not gold

“-¡Ah! usted mismo no tardará en reconocerlo. No es oro todo lo que reluce. Verdad es que para mí nunca ha brillado el D. Rafaelito sino como hojalata.” — -Ah! it will not take long for you to recognize it yourself. Not all that glitters is gold. It is true that for me Don Rafaelito has never shone but like tin