～だに

✦ Used in an affirmative form to express emotions like "even though not directly experienced, just ... is enough".
✦ Used to express feelings of anxiety or negative emotions like "恐ろしい・辛い・難しい".
✦ 「～さえ～ない」: It has almost limitless applications and often carries negative connotations.
✦ 「～だに」: Expresses one's emotional thoughts.