Great topic on correspondences and manifestations of yin and yang in the plain questions (Fifth article part I) [1]

When a disease begins, needling can stop it. When the disease is serious, wait until the disease wanes some and then needle to stop it. Thus, dissipate it according to its slightness. Relieve it according to its seriousness. Tonify it according to its debilitation. When the form is insufficient, warm it with qi; when the essence is insufficient, supplement it with flavors.

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