In Greek mythology, the constant cycle that embodies the human condition is often represented by the myth of Sisyphus or the Labors of Hercules. These tales illustrate the themes of struggle, perseverance, and the repetitive nature of existence. Sisyphus's punishment of rolling a boulder up a hill only for it to roll back down symbolizes the futility and relentless challenges faced in human life. These myths resonate with the idea of enduring despite hardships, reflecting the cyclical nature of life and human endeavors.