That phrase is the title of the of the anime series Saint Seiya (known as Knights of the Zodiac in some regions) [1].
In this episode, the protagonist battles Cassios in Greece to earn the Pegasus Cloth , marking the beginning of his journey as a Saint [1]. If you're looking for more info, I can find: Where to stream the series A summary of the plot for this episode or the season The manga chapters that correspond to this episode 1 : He Who Would Challenge the Sun