In the Myoshin-ji school of Rinzai Zen to be a head of the meditation hall (i.e. an actual Zen teacher who trains others) one is required to be unmarried and live pretty much like a monk in other countries. Just another example.
"The shike (師家) is the teacher (師) in the monastic household (家). He is the "true" shukke who has - ideally, but not necessarily - gone through all the koan of the particular monastic koan-system, and who stays permanently in monastic life leading the monastery and guiding the monks, thus also referred to as the "elder teacher in the monk's hall" (sōdō rōshi). He has received the certificate of enlightenment (inka shōmei) just as he himself can transmit this to his successor. Unless returning to lay life, or taking up a position as priest in a temple, a shike within the Myoushinji sect is not allowed to marry but must keep the strict rules of renouncement. As such he has the prestige and generally owns the respect of being a true Zen master, a living symbol of the Zen monastic tradition, the quintessence of zen virtues ideally incarnating wisdom, spirituality, strict discipline, individuality, and yet gentle social personality. He is, in a certain sense, the religious main figure."
(Jørn Borup: Japanese Rinzai Zen Buddhism: Myōshinji, a Living Religion, p. 60)
"While teachers of the middle way, mind only, transcendent wisdom, mantra, and other schools may have their own assertions, the fulfillment of those intentions is the same. There is not a single thing that is not contained within mind."
(Gampopa to Düsum Khyenpa, in "The First Karmapa", KTD Pub, p254)
“If you recognize the world of appearance and existence as the mind, realize the mind itself as empty, and have no grasping at the superiority of your realizations — this is the ultimate view."
(Chegom Dzongpa, in "The Book of Kadam", Wisdom Pub, p609)