Hagrid, trying to explain why Harry's life is so dangerous, reveals that Voldemort was after the Sorcerer's Stone, an object of immense power created by Nicolas Flamel, an alchemist who lived for centuries thanks to the stone.
Here's how it happens:
1. Hagrid's visit: Hagrid visits Harry at Privet Drive to explain everything about his magical heritage and Voldemort.
2. The Sorcerer's Stone: Hagrid mentions the Sorcerer's Stone as the reason Voldemort wanted to return to power.
3. The secrets of the stone: Hagrid says the stone is guarded at Hogwarts and that it's been hidden for centuries by a man called Nicolas Flamel.
4. The mystery of Flamel: Harry asks who Flamel is, and Hagrid, surprisingly, doesn't know much about him. This piques Harry's curiosity about the mysterious alchemist.
This encounter with Hagrid is crucial to Harry's journey, as it sets him on the path to uncover the secrets of the Sorcerer's Stone and face Voldemort.