A teacher always penetrates the sutras. To penetrate means to make the sutras the land, the body, and the mind. A teacher makes the sutras a structure for guiding others.
A teacher makes them sitting, lying down, and walking; father and mother; and descendants. Using the sutras as practice and understanding, a teacher fully masters the sutras. A teacher’s washing the face and having tea are the ancient sutras. The sutras give birth to a teacher.
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The sutras are the entire world of the ten directions. There is no moment or place that is not sutras. The sutras are written in letters of the supreme principle and of the secular principles. The sutras are written in letters of heavenly beings, human beings, animals, fighting spirits, one hundred grasses, or ten thousand trees. This being so, what is long, short, square, and round, as well as what is blue, yellow, red, and white, arrayed densely in the entire world of the ten directions, are no other than letters of the sutras and the surface of the sutras. Regard them as the instruments of the great way, and as the sutras of the buddha house.
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Thus, buddhas and bodhisattvas make no contrivance of their own by way of thought or no-thought. Each makes a great vow to attain the sutras.The moment when you determine to attain the sutras is not past or present, because past and present are the time when you already attain the sutras. What emerges in the face of the entire world of the ten directions is the attaining of the sutras.When you read, recite, and penetrate the sutras, buddha wisdom, spontaneous wisdom, or no-teacher wisdom are manifested prior to the mind and prior to the body. At this time there is nothing new or extra-ordinary that makes you wonder. That the sutras are held, read, and recited by you means that the sutras guide you.
— Dogen, SBGZ ‘Bukkyo’ (‘Buddha Sutras’), Tanahashi 2010, 537-9