"от чистого сердца" meaning in Russe

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en russe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions adverbiales en russe",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Russe",
      "orig": "russe",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de от, чистый et сердце."
  ],
  "lang": "Russe",
  "lang_code": "ru",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "glosses": [
        "Du fond du cœur."
      ],
      "id": "fr-от_чистого_сердца-ru-adv-PGcvudnA"
    }
  ],
  "word": "от чистого сердца"
}

{
  "categories": [
    "Compositions en russe",
    "Locutions adverbiales en russe",
    "russe"
  ],
  "etymology_texts": [
    "Composé de от, чистый et сердце."
  ],
  "lang": "Russe",
  "lang_code": "ru",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "glosses": [
        "Du fond du cœur."
      ]
    }
  ],
  "word": "от чистого сердца"
}