The reason Zhang Xuan had chosen to cast himself aside and tour the world was due to the confusion in his heart. He had found himself lost, and he needed some directions.
He had looked at Kong shi's records, but their lives had been vastly different. As two completely different people, he could not hope to experience the same things as Kong shi even if he forced himself to retrace Kong shi's footsteps.
He knew that becoming the World's Teacher was the way for him to become an Ancient Sage, but how could he do it? The world was such a huge place, and it was governed by its own laws. It was not as if his words could reach the heavens, so how could he become the World's Teacher?
Unable to make sense out of this, he had found himself falling into a stalemate. No matter how he struggled, he had been unable to advance any further at all.