Eugen Herrigel said this quote
“ And what impels him to repeat this process at every single lesson, and, with the same remorseless insistence, to make his pupils copy it without the least alteration? He sticks to this traditional custom because he knows from experience that the preparations for working put him simultaneously in the right frame of mind for creating. The meditative repose in which he performs them gives him that vital loosening and equability of all his powers, that collectedness and presence of mind, without which no right work can be done. ”