Love, immortality, heart, soul
Love can release, save, redeem and free the soul – give it eternal life, immortality – e.g. the little mermaid or "Alferne paa Heden" ('the faries on the moor'), who may be given eternal life from the love of a human, or, in the case of the fairies, by "a tear of remorse or empathy from the human heart", the angel's love for Inger in "The Girl, Who Trod on the Loaf", Gerda's tears, which thaw Kay's frozen heart in "The Snow Queen" or Sorrow's tear in "The Last Pearl", the pearl that lifts the soul towards the eternal.
According to Flemming Hovmann's commentary p. 95 in vol. 7 of H.C. Andersens eventyr, Dansk Sprog- og Litteraturselskab / Borgen 1990, it is a wellknown motif in popular belief, that tears have such power.
Out there in the snow sat a woman, dressed in long black garments. "Death," she said, "has been in your house. I just saw him hurrying away with your child in his arms. He goes faster than the wind. And he never brings back what he has taken away."
"Tell me which way he went," said the mother. "Only tell me the way, and I will find him."
"I know the way," said the woman in black, "but before I tell you, you must sing to me all those songs you used to sing to your child. I am night. I love lullabies and I hear them often. When you sang them I saw your tears."
"I shall sing them again-you shall hear them all," said the mother, "but do not stop me now. I must catch him. I must hurry to find my child."
Night kept silent and still, while the mother wrung her hands, and sang, and wept. She sang many songs, but the tears that she shed were many, many more. At last Night said to her, "Go to the right. Go into the dark pine woods. I saw Death go there with your child."
Deep into the woods the mother came to a crossroad, where she was at a loss which way to go. At the crossroad grew a blackthorn bush, without leaf or flower, for it was wintertime and its branches were glazed with ice.
"Did you see Death go by with my little child?"
"Yes," said the blackthorn bush. "But I shall not tell you which way he went unless you warm me against your heart. I am freezing to death. I am stiff with ice."
She pressed the blackthorn bush against her heart to warm it, and the thorns stabbed so deep into her flesh that great drops of red blood flowed. So warm was the mother's heart that the blackthorn bush blossomed and put forth green leaves on that dark winter's night. And it told her the way to go.