Three simple questions, three great pieces of philosophy. But Di Tou wasn't thinking about the entirety of the human race when asking these questions, nor was he pondering the meaning of existence. He meant it very simply.
"Who am I?"
When he arrived in this world, he could still delude himself, telling himself that he was Di Tou, a very ordinary person who had just happened upon a strange occurrence. No matter how odd it was… well, it was just a matter of probability, right? With so many people on Earth and so many seconds passing, as long as the cultivation world existed, it was inevitable that sooner or later someone would be sent over.
When he was the fake Mu Di Bai, when he was Yin Shi Tou… he could still fairly confidently say that he was Di Tou. [A Humble Heart] helped with that too. Through all his adventures then, he knew who he was deep in his heart. But after living here for a decade, he really… didn't know anymore.