在追求统一理论的过程中，我们必须拥抱未知，并愿意质疑我们最珍视的信念。

I keep thinking about this river somewhere, with the water moving really fast. And these two people in the water, trying to hold onto each other, holding on as hard as they can, but in the end it’s just too much. The current’s too strong. They’ve got to let go, drift apart.

1983年12月，杨振宁向邓小平建议