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Phrase(s): They also serve who only stand and wait.
Prov. Sometimes you must be patient and do nothing, even though you would like to be actively helping. (From John Milton’s poem, "On His Blindness.") • Jill: Can I help? Jane: No, we’ve got enough people helping. Jill: But I want to help. Jane: They also serve who only stand and wait.
McGrawhill's American Idioms And Phrasal Verbs