‘I will now speak of the proper functioning of the mind during zazen. Beginners often ask me about their problems; however, it is very difficult for me to be of any help to them. Neither a short nor a complicated answer to peoples’ questions is really helpful. It is all right to ask me questions, but it is not enough. One must experiment for oneself and then one will understand. After reading a book on the subject of swimming one must get in the water and find out about it first hand. A book cannot give one the experience.
There are various ways of “quieting” the mind. The first way is “putting the mind In the left hand,” which means projecting the mind into the inzo, or hand position. The inzo symbolizes the Buddha. When our mind is in the inzo, the body and breathing will be right.
In Rinzai training, the kosoku koan is used to quiet (to clear) the mind. This is a good way to cultivate the Zen way of seeing; however, I think it is better to develop the Zen condition by shikantaza. This means devoting oneself solely to sitting; by quieting the mind and putting it in the. left hand. The “Zen eye” finds its source in the Zen condition, and the Buddha’s enlightenment is not the Zen eye, but the Zen condition. In Soto Zen we just sit; this is the most natural way. The main aim of zazen is to “let go of mind and body”; however, Buddhists sometimes pay too much attention to the mind and therefore they cannot get rid of it. The kosoku koan may be useful; however, shikantaza is better because one has a tendency to cling to the koan and to one’s mind. Although we should “put the mind in the left hand,” we must not pay attention to the mind. When we pay too much attention to the left hand, we are preventing satori. When we consciously put the mind in the hand, it is wrong. There are various kinds of good meditation. Satori is beyond all of these, and it is necessary to pass through the many regions of the mind before enlightenment.’ (The Way of Zazen)
Apparently, this booklet was one of the few zen texts available in English to Suzuki Roshi’s early students – I found it an interesting read on how Dogen’s zazen is currently understood.