Wang Bi
The leading themes revolve around the nature of Tao and how to attain it. Tao is said to be ineffable, and accomplishing great things through small means. Ancient commentaries on the "Tao Te Ching" are important texts in their own right. Perhaps the oldest one, the "Heshang Gong" commentary, was most likely written in the 2nd century CE. Other important commentaries include the one from Wang Bi and the Xiang'er.