‘Zazen itself is the teacher of zazen, not a person. Zazen will teach you about zazen and therefore it is necessary to continue persistently and without negligence. Zazen is not a matter of understanding the nature of delusion. If zazen itself does not end up becoming delusion, how will it be possible to ascertain the nature of delusion? This applies not only to delusion, but to anxiety, fear, and other mental afflictions, or to conflict between self and other. If the ego-self does not intervene, then it is certainly possible for affliction to become delusion – to become greed, anger, and ignorance. Then we will be able to understand the nature of the thing itself. The strength to push on to this understanding is called the “Way-seeking mind.”‘ (Unfathomable Depths)