Yet you must not cling to the words of the old sages either; they, too, may not be right. Even if you believe them, you should be alert so that , in … - Dōgen

It is taught that all buddhas in the past, present, and future leave the household and attain the way. The twenty-eight ancestors in India and the six early ancestors in China who transmitted the Buddha's mind seal were all monks. They are distinguished in the three realms by strictly observing the precepts. Thus precepts are primary for practicing Zen in pursuit of the way. How can one become a buddha ancestor without becoming free from faults and preventing wrongdoing?

Your body is like a dew-drop on the morning grass, your life is as brief as a flash of lightning. Momentary and vain, it is lost in a moment. (From 'Fukan zazengi')

"Kind speech" means that when you see sentient beings, you arouse the heart of compassion and offer words of loving care. It is contrary to cruel or violent speech.