‘Descendants of buddha ancestors, do not study the Agama teachings, the teachings of Brahmans, the methods of making sacrifices, teachings about the pursuit of pleasure, or the teachings of the [extremist] opponents of pursuing pleasure. Save your head from fire, and just study the fists, eyeballs, whisks, sitting cushions, Zen sleeping boards, ancestral minds, and ancestral sayings of the buddhas and ancestors. If it is not the activity of buddha ancestors, do not practice it; if it is not the talk of buddha ancestors, do not say it. Great assembly, do you want to clearly understand the key to this?
After a pause Dogen said: [Practice with] sitting cushions, Zen boards, and Zhaozhou’s tea, not expressing evil through the whole day. The ancient buddhas have studied the true meaning. Sanavasin received transmission and wore Buddha’s monk’s robe.’ (Extensive Record, 380)
I think just not expressing evil through the whole day would be a pretty great place to start.