I had a new student come round last night.
It was really helpful - I always find I learn more from my students than they do from me. What I (re)learnt from him was the value of "beginner's mind" - that sharp-witted, open-hearted, entirely committed state which brings the best spiritual practice.
It shone a mercilessly bright searchlight straight at my own practice, which had become so stale it was just an occasional token nod in the vague direction of Zen. What's the point of pretending to practise?
Thus learning from his example, I turned myself back into an absolute beginner by adopting a form of Zen practice entirely new to me. (For those that are interested, I have replaced my fake shikantaza with naikan. If you're not familiar with naikan, there's an excellent summary at http://en.wikipedia.org/wiki/Naikan and an explanation with some helpful real-life examples at http://www.todoinstitute.com/naikan.html.)
Of course, it's not entirely new to me, in that all Zen practices are just different fingers pointing towards the same Great Mind. However, it is new enough to have given me back that "beginner's mind" - and suddenly Zen seems once more like a blessing, not a chore.