Shobogenzo Shoaku-Makusa 2: Freeing Action.

Master Dogen commences his discussion of right action by citing this verse:

Don't do wrong, do right;

Then our minds become pure naturally;

This is the teaching of the buddhas.

His commentary on it begins:

This [teaching], as the Universal Precept of the ancestral patriarchs, the Seven Buddhas, has been authentically transmitted from former buddhas to later buddhas, and later buddhas have received its transmission from former buddhas. It is not only of the Seven Buddhas: It is the teaching of all the buddhas. We should consider this principle and master it in practice. These words of Dharma of the Seven Buddhas always sound like words of Dharma of the Seven Buddhas.

His view of right conduct then is this standard that is transmitted between buddhas, and it is something that is mastered in direct practice, as opposed, say, moral or religious belief alone.

What has been transmitted and been received one-to-one is just clarification of the real situation at this concrete place. This already is the teaching of the buddhas; it is the teaching, practice, and experience of hundreds, thousands, and tens of thousands of buddhas.

Master Dogen grounds this 'not doing wrongs' as a matter of our real here-and-nowness: It's our real situation when we are dropping off thoughts and feelings in zazen, or at time when we are otherwise sincerely acting in a way where we are clarifying our experience in not being pushed around by our thoughts and feelings in our habitual ways. At such time we are in direct accord with everyone else who has ever, or will ever, act and experience our life directly in the same way.

The standard of moral action, of 'not doing wrongs', that Master Dogen is indicating is our conduct here and now as clarified in zazen, where we see our thoughts and emotions about any moment as what they really are, and can choose to act free of them.