Final Instructions of Master Kozen Daito (English Translation)

O you, monks, who are in this mountain monastery, remember that you are gathered here for the sake of religion and not for the sake of clothes and food. As long as you have shoulders [that is, the body], you will have clothes to wear, and as long as you have a mouth, you will have food to eat. Be ever mindful, throughout the twelve hours of the day, to apply yourselves to the study of the Unthinkable. Time passes like an arrow, never let your minds be disturbed by worldly cares. Ever, ever be on the lookout. After my departure, some of you may preside over five temples in prosperous conditions, with towers and halls and holy books all decorated in gold an silver, and devotees may noisily crowd into the grounds; some may pass hours in reading the sutras and reciting dharanis, and sitting long in contemplation may not give themselves up to sleep; they may, eating once a day and observing the fastdays, and, throughout the six periods of the day, practice all the religious deeds. Even when they are thus devoted to the cause, if their thoughts are not really dwelling on the mysterious and untransmissible Way of the Buddhas and Fathers, they may yet come to ignore the law of moral causation, ending in a complete downfall of the true religion. All such belong to the family of evil spirits; however long my departure from the world may be, they are not to be called my descendants.

Let, however, there be just one individual, who may be living in the wilderness in a hut thatched with one bundle of straw and passing his days by eating the roots of wild herbs cooked in a pot with broken legs; but if he single-mindedly applies himself to the study of his own [spiritual] affairs, he is the very one who has a daily interview with me and knows how to be grateful for his life. Who should ever despise such a one? O monks, be diligent, be diligent.

From Manual of Zen Buddhism, D.T. Suzuki