The Power of the Mother-Daughter Bond.
Human civilization is based on agriculture, in Greece presided over by Demeter. The Eleusinian mystery religion centered on her worship and on reverence for her lost daughter. Persephone was mown down and torn from her mother just as the sheaf in Demeter's hand is reaped from the bosom of Mother Earth. Before Demeter rescues her daughter from the underworld, she creates winter dark and cold as an outward sign of her grief.