Translation : Keeping a constant mind is the best way.
Brief explanation : You must keep the mind situation as it is and as the truth. The worst is your ego which sways you. If you have not gone astray by ego, you are able to accomplish your purpose. For Zen, martial arts, tea ceremony and any others, this mind is common. Both at the time of practice and at the important time, to get into the habit of keeping your ordinary and constant mind is the best way. For example, at a martial art match, if you are always stained, you lack for this ordinary and constant mind. A good player can always keep a constant mind.