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                                   "A liars mouth, is a futile device; vain, useless, and worthless. Don't 

believe in liars, for their device can be inherited"
- Melany L. Mendoza

A liars mouth is nothing more than a futile device, meaning their words  are incapable of producing any useful result. Their habit of lying can influence others to also be a liar, hence " for their device can be inherited".