Dogen instructed,

It is rather easy to lay down one’s own life, and cut off one’s flesh, hands, or feet in an emotional outburst. Considering worldly affairs, we see many people do such things even for the sake of attachment to fame and personal profit.

Yet it is most difficult to harmonize the mind, meeting various things and situations moment by moment. A student of the Way must cool his mind as if he were giving up his life, and consider if what he is about to say or do is in accordance with reality or not. If it is, he should say or do it.