These lines from a well-known Zen poem provided the motto for a 38-day Sesshin (Zen retreat) in Val d'Isère in the French Alps. Zen is Zazen, meditation, sitting in the Buddha posture, and it is the oral teaching (Kusen) of an authentic transmission master. This book offers a deep insight into this tradition: it contains the collected Kusen of this Sesshin in chronological order and makes it clear that Zen teachings are not prepared lectures, but arise spontaneously in the context of everyday life within a Zen community and in unity with the spirit of the students; that Zen education is not the transmission of knowledge, but understanding and strict yet loving guidance on the path of the Buddha.