Then there is another type of person [who says,] "To pursue the way in seated meditation is a function essential for the "beginner's mind and the latter-day student", but it is not necessarily an observance of the buddhas and ancestors. 'Walking is Zen, sitting is Zen; whether in speech or silence, motion or rest, the substance is at ease.' Do not adhere solely to the present concentrated effort [of seated meditation]." ... It is because they are deficient in transmitting the right life of the buddha-dharma that they speak thus. What is the "beginner's mind"? Where is there no "beginner's mind"? Where do we leave the "beginner's mind"?
Be it known that, for studying the way, the established [means of] investigation is pursuing the way in seated meditation.
From: Zazenshin: ???. Lancet of Zazen (Bielefeldt)
http://hcbss.stanford.edu/research/proj ... nshin.html