Significado de la palabra "nothing comes out of the sack but what was in it" en español

¿Qué significa "nothing comes out of the sack but what was in it" en inglés? Descubre el significado, la pronunciación y el uso específico de esta palabra con Lingoland

nothing comes out of the sack but what was in it

US /ˈnʌθ.ɪŋ kʌmz aʊt əv ðə sæk bʌt wʌt wəz ɪn ɪt/
UK /ˈnʌθ.ɪŋ kʌmz aʊt əv ðə sæk bʌt wɒt wəz ɪn ɪt/
"nothing comes out of the sack but what was in it" picture

Modismo

del saco no sale más que lo que hay dentro

you cannot get more out of something than what was originally put into it; a person's actions or words reflect their true character or knowledge

Ejemplo:
He tried to sound like an expert, but nothing comes out of the sack but what was in it.
Intentó parecer un experto, pero del saco no sale más que lo que hay dentro.
If you don't study, you can't expect to pass; nothing comes out of the sack but what was in it.
Si no estudias, no puedes esperar aprobar; del saco no sale más que lo que hay dentro.