As a university professor, I have been immersed in theory and guess for so long that it recently struck me: I don't know how to do anything. By "do", I mean something material, something done with my hands that produce an actual product.

The trades come to mind. Whenever I call an electrician, or a mason, or a carpenter, I look on in wonder as they smoothly employ their skills. For example, I recently had a new kitchen sink nulled by a young man. He kept singing as he worked at the pipes. Minutes later, he turned on the water and it flowed forth with nothing similar to a leak. Is this not a minor miracle?

All of this brought me to a decision: I registered for an adult evening course at a local technical school. The title: Basic Electricity and Wiring (线路). When we began, I felt immediately overwhelmed. So many new terms. In an instant, I was a student again in all respects: The anxiety, the self-doubt, the wondering if I had made a mistake. And then I recalled: "Nothing in the world can take the place of persistence... Education will not; the world is full of educated failures." So I worked my way through my basic wiring course. My initial impulse to jump ship gradually gave way to the awareness that I was, indeed, acquiring a useful new skill.

What followed ahead was the course's climax: Each student was presented with a switch and a lighting fixture (照明设备). The task was to install them-in-a-door-frame and-wire them; but not throw the switch until the instructor was present. There I was, an experienced professor, standing like a fresh-faced schoolboy. I worked away, using my tools to connect wires. When I was done, I raised my hand. The instructor looked over my job and glanced at me. "Hit the switch," he said.

It's hard to characterize that moment. But I did feel that learning is not something that ends early in life. I need to widen my horizon through constant learning. The broader the horizon, the more opportunities there are to learn something new.

I hit the switch.

There was light.

In more ways than one.