We follow the path of least resistance, even when it is insurmountable, even when there are easier paths around or through. Sometimes the most difficult and most important thing is to stop and see this.
On retreat, perhaps at first you see what you are doing: I am meditating long hours; I am practicing with the koans; I am doing something different. Perhaps next you notice what you are not doing: I am not posting all of the time; I am not slacking off there; I am not scratching that itch; I am not following my habits. At first, maybe there is "I have left" and later there is "I have returned."
Perhaps finally, though, in spite of all of the thinking and doing, in spite of all of the not thinking or not doing, the difficult path was a round trip in which you never left home at all.
How could you?