"Ah, that's the universe at large," he said, "incommensurable, nonlinear, outside the realm of syntax. The sorcerers of ancient Mexico were the first ones to see those fleeting shadows, so they followed them around. They saw them as you're seeing them, and they saw them as energy that flows in the universe. And they did discover something transcendental." He stopped talking and looked at me. His pauses were perfectly placed. He always stopped talking when I was hanging by a thread. "What did they discover, don Juan?" I asked. "They discovered that we have a companion for life," he said, as clearly as he could. "We have a predator that came from the depths of the cosmos and took over the rule of our lives. Human beings are its prisoners. The predator is our lord and master. It has rendered us docile, helpless. If we want to protest, it suppresses our protest. If we want to act independently, it demands that we don't do so."