Let go of the eye, and the whole body-and-mind are nothing but the eye; let go of the ear, and the whole universe is nothing but the ear.

Dogen Zenji

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The point of our zazen practice is to be free from thinking mind and from emotional activity. In short, that is the practice of selflessness. In our observation of rituals, the point is to be free from selfish ideas. The practice of rituals is the practice of selflessness.

Shunryu Suzuki Roshi (Zazen, Rituals and the Precepts).