The myth of Demeter highlights the agricultural cycle, specifically the changing seasons and the importance of fertility. As the goddess of harvest and grain, her narrative, particularly involving her daughter Persephone, symbolizes the cycle between life and death, growth and dormancy. The descent of Persephone into the underworld leads to Demeter's grief, resulting in winter, while her return brings forth spring. This cycle emphasizes humanity's reliance on nature and the interconnectedness of life.