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Phrase(s): Fine words butter no parsnips.
Prov. Just because someone promises something does not guarantee that he or she will do it. (Can be used as a rebuke, implying that the person you are addressing is promising something he or she will not do, as in the second example.) • Sue: Tom promised he would buy me any house I want if I marry him! Jane: Fine words butter no parsnips. • Fred: Sweetheart, I’m very sorry I’ve been so short-tempered. I’ll never, never be like that anymore. Ellen: Fine words butter no parsnips.
McGrawhill's American Idioms And Phrasal Verbs