"be still my heart" meaning in English

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      "examples": [
        {
          "ref": "1868, Charles Reade, chapter 8, in Foul Play:",
          "text": "How strange, how hellish (God forgive me for saying so!) it seems that she should love him. But, does she love him? Can she love him? Could she love him if she knew all? Know him she shall before she marries him. For the present, be still, my heart.",
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          "ref": "1986, Priscilla Scherer, “Reflections: Daytime Drama,”, in The American Journal of Nursing, volume 86, number 1, page 106:",
          "text": "Roll tape! Action!\n\"I can't feel a pulse!\" shouts Ms. Brunette Beauty, RN.\n\"Call a code!\" commands Blue-Eyed Hunk, MD. . . .\nHe's talking to me. Be still my heart.",
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          "ref": "2004 December 10, Michael O'Sullivan, “In Baltimore, Seeing the '(In)visible'”, in Washington Post, retrieved 2008-07-15:",
          "text": "Calling her installation \"information as art,\" Hesh will have 28 separate documents and artifacts on view, one of which is—be still my heart—a stack of old newspapers.",
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        "An admonition to oneself to calm down when overly excited, especially in terms of romantic attraction."
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        "(idiomatic) An admonition to oneself to calm down when overly excited, especially in terms of romantic attraction."
      ],
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        {
          "word": "be still my beating heart"
        }
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  "word": "be still my heart"
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          "ref": "1868, Charles Reade, chapter 8, in Foul Play:",
          "text": "How strange, how hellish (God forgive me for saying so!) it seems that she should love him. But, does she love him? Can she love him? Could she love him if she knew all? Know him she shall before she marries him. For the present, be still, my heart.",
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          "ref": "1986, Priscilla Scherer, “Reflections: Daytime Drama,”, in The American Journal of Nursing, volume 86, number 1, page 106:",
          "text": "Roll tape! Action!\n\"I can't feel a pulse!\" shouts Ms. Brunette Beauty, RN.\n\"Call a code!\" commands Blue-Eyed Hunk, MD. . . .\nHe's talking to me. Be still my heart.",
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          "ref": "2004 December 10, Michael O'Sullivan, “In Baltimore, Seeing the '(In)visible'”, in Washington Post, retrieved 2008-07-15:",
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        "(idiomatic) An admonition to oneself to calm down when overly excited, especially in terms of romantic attraction."
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      "word": "be still my beating heart"
    }
  ],
  "word": "be still my heart"
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