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Phrase(s): Hope is a good breakfast but a bad supper.
Prov. It is good to start the day feeling hopeful, but if none of the things you hope for come to pass by the end of the day, you will feel disappointed. (Can be used to warn someone against hoping for something that is unlikely to happen.) • Lisa began the day hoping that she would find work, and by the end of the day she had learned that hope is a good breakfast but a bad supper.
McGrawhill's American Idioms And Phrasal Verbs