Topic on discussion of profundity and subtlety of pulse essentials in the plain questions (Seventeenth article part VI)

The pulse variations correspond to the running of the heaven and earth. It is so vast and subtle! Outside everything and inside the six directions, every variation of the heaven and earth corresponds to that of the yin and yang. Spring's warmth becomes summer's heat, and the brisk of coolness of autumn becomes winter's piercing cold.

Key Words: discussion of profundity and subtlety of pulse essentials, in the plain questions