The text is taken from the teaching which Peter gave orally during a retreat in August 2002: the 7 days of the retreat gave takes the form of the 7 chapters, for a fruitful dialogue between practices and theoretical principles.
The problem is that we often take obstacles as something to be avoided. Obstacles are, however, necessary to life; we must fall and retreat in order to progress. The question concerns not the obstacle itself, but how I relate to this fall, to this loss.