To reach the valley of ambiguity, one must pass through the city of skepticism. This means that in order to gain a deeper understanding of the world, one must first question and doubt everything that they have been taught. They must be willing to let go of their preconceived notions and beliefs, and be open to new ideas and perspectives.
The journey through the valley of ambiguity can be challenging and frustrating, as it is not always clear which path to take. However, it is also a necessary step in the pursuit of truth and understanding. By navigating through the ambiguity, one can eventually reach a place of clarity and insight.