Greetings, perceptive Sangha. This may be a somewhat ignorant question, but I have read that in Zen it is possible for a layperson to achieve the highest understanding of emptiness, i.e. enlightenment. In fact, the understanding of a highly realized layperson (it is said) can even surpass that of a monkish disciple of the Buddha (e.g. see the Vimalakirti Sutra). If that is true, what is the purpose of a Zen monastery? And why wasn't that tradition jettisoned the way that religious celibacy was eschewed by Protestants breaking away from the RC Church (to draw a very rough analogy between Buddhist and Christian institutions)?