In this short passage, Ken points to two aspects of practice. One is to experience completely, so that life is lived fully with few echoes or reverberations. The other is to do completely, to give full attention and leave nothing half-done or trailing behind.
I feel these as distinct yet inseparable. To experience completely asks for openness to whatever is here, pleasant, neutral, or painful. To do completely asks for wholehearted responses to life experiences. A key here is balance: openness can become inward, passive, or ungrounded, while wholehearted response can become driven, performative, or self-important.
This passage reminds me of the famous line in the Heart Sutra: form is emptiness, emptiness is form. It also brings to mind the two wings of Mahayana practice, emptiness and compassion. Taken together, they point to a balanced practice: emptiness or wisdom prevents compassion from collapsing into sentimentality, attachment, or the need to fix everything, and compassion prevents wisdom from hardening into abstraction, coldness, or nihilism.