In this dharma talk Kisei explores the phrase from Hongzhi in Silent Illumination:

If serenity neglects illumination; murkiness leads to wasted dharma.

This life is a play of emptiness and illumination, yin & yang. When the emptiness side (which also can be defined as silence, serenity, darkness, unknowing) gets off balance--what happens to our lives? our practice? our awakening?

This talk is a deep exploration of the ins and outs of emptiness.