And if you remember the story about Sisyphus, Sisyphus was punished by the gods to push the same rock up a hill, and when he almost got to the end, the rock would roll over, and he would have to start again.
Si recordeu la història de Sísif, els déus van castigar Sísif a empènyer una roca muntanya amunt i quan gairebé arribava al cim, la roca queia muntanya avall i havia de començar de nou.